

Hero image 0 of Flowmaster 817940 Crossmember Back Exhaust System 2.5" 409 Stainless, 0 of 8
Flowmaster 817940 Crossmember Back Exhaust System 2.5" 409 Stainless
(No ratings yet)
Check if this fits your vehicle
Key item features
- Robust Construction: Features 16-gauge, 2.50-inch 409 stainless steel pipes for enhanced durability and strength.
- Optimized Performance: Mandrel-bent pipes maximize exhaust flow, while Super 44 mufflers deliver increased performance and an aggressive to moderate sound.
- Versatile Compatibility: Crossmember-back design works with stock manifolds or headers, fitting 1967-1972 Chevrolet/GMC K10, K15/K1500, K20, K25/K2500 4WD V8 trucks.
- Enhanced Scavenging: An H-pipe style crossover aids exhaust gas scavenging and effectively reduces drone.
- Customizable Aesthetics: Offers three distinct tailpipe exit options, allowing for personalized styling.
- Complete Installation: Includes all necessary hangers and hardware for a straightforward installation process.
Generated by AI
Specs
- Vehicle makeChevrolet, GMC
- Vehicle modelK10, K15, K1500, K20, K25, K2500
- Vehicle year1967, 1968, 1969, 1970, 1971, 1972
- Muffler typePerformance Mufflers
- Material409 Stainless Steel
- BrandFlowmaster
Current price is USD$999.95
Price when purchased online
- Free shipping
Free 90-day returns
How do you want your item?
Try 30 days of Free Shipping with Walmart+! Choose plan at checkout.
Columbus, 43215
Arrives by Thu, Feb 12
Sold and shipped by Walmart.com
Free 90-day returns
More seller options (1)
Starting from $999.95
Compare with similar items
| Product | Viewing this itemFlowmaster 817940 Crossmember Back Exhaust System 2.5" 409 Stainless ![]() $999.95 current price $999.95 | Flowmaster Signature Series Exhaust System ![]() $1,058.63 current price $1,058.63 | Flowmaster 817659 Crossmember-back System - Force II - 70-73 Corvette - Moderate Sound ![]() $1,199.95 current price $1,199.95 | Flowmaster 817938 American Thunder Crossmember-Back Exhaust System 2.5" 409 Stainless Dual Exit ![]() $870.95 current price $870.95 | Flowmaster Signature Series Exhaust System ![]() $916.37 current price $916.37 | Flowmaster Signature Series Exhaust System ![]() Now $888.52 current price Now $888.52, Was $966.60$966.60 | Flowmaster Signature Series Exhaust System ![]() $737.15 current price $737.15 | Flowmaster 818204 American Thunder Direct Fit Muffler ![]() $665.95 current price $665.95 | Flowmaster 817818 Outlaw Exhaust System Kit ![]() $614.95 current price $614.95 |
|---|
| Vehicle make | ChevroletFlowmaster 817940 Crossmember Back Exhaust System 2.5" 409 Stainless | RamFlowmaster Signature Series Exhaust System | ChevroletFlowmaster 817659 Crossmember-back System - Force II - 70-73 Corvette - Moderate Sound | FordFlowmaster 817938 American Thunder Crossmember-Back Exhaust System 2.5" 409 Stainless Dual Exit | FordFlowmaster Signature Series Exhaust System | Chevrolet; GMCFlowmaster Signature Series Exhaust System | ToyotaFlowmaster Signature Series Exhaust System | RAMFlowmaster 818204 American Thunder Direct Fit Muffler | ChevroletEXHAUST SYSTEM | JeepFlowmaster 817818 Outlaw Exhaust System Kit |
|---|---|---|---|---|---|---|---|---|---|---|
| Vehicle model | K10Flowmaster 817940 Crossmember Back Exhaust System 2.5" 409 Stainless | 1500Flowmaster Signature Series Exhaust System | Corvette StingrayFlowmaster 817659 Crossmember-back System - Force II - 70-73 Corvette - Moderate Sound | F-100Flowmaster 817938 American Thunder Crossmember-Back Exhaust System 2.5" 409 Stainless Dual Exit | F-150Flowmaster Signature Series Exhaust System | -Flowmaster Signature Series Exhaust System | TacomaFlowmaster Signature Series Exhaust System | 1500Flowmaster 818204 American Thunder Direct Fit Muffler | SILVERADOEXHAUST SYSTEM | WranglerFlowmaster 817818 Outlaw Exhaust System Kit |
| Vehicle year | 1967Flowmaster 817940 Crossmember Back Exhaust System 2.5" 409 Stainless | 2019Flowmaster Signature Series Exhaust System | 1973Flowmaster 817659 Crossmember-back System - Force II - 70-73 Corvette - Moderate Sound | 1967Flowmaster 817938 American Thunder Crossmember-Back Exhaust System 2.5" 409 Stainless Dual Exit | 2021Flowmaster Signature Series Exhaust System | 2019Flowmaster Signature Series Exhaust System | 2016Flowmaster Signature Series Exhaust System | 2025Flowmaster 818204 American Thunder Direct Fit Muffler | 2019EXHAUST SYSTEM | 2018Flowmaster 817818 Outlaw Exhaust System Kit |
| Muffler type | Performance MufflersFlowmaster 817940 Crossmember Back Exhaust System 2.5" 409 Stainless | Straight-Through MufflersFlowmaster Signature Series Exhaust System | Performance MufflersFlowmaster 817659 Crossmember-back System - Force II - 70-73 Corvette - Moderate Sound | Performance MufflersFlowmaster 817938 American Thunder Crossmember-Back Exhaust System 2.5" 409 Stainless Dual Exit | Performance MufflersFlowmaster Signature Series Exhaust System | Straight-Through MufflersFlowmaster Signature Series Exhaust System | Straight-Through MufflersFlowmaster Signature Series Exhaust System | Chambered MufflersFlowmaster 818204 American Thunder Direct Fit Muffler | Straight-Through MufflersEXHAUST SYSTEM | Performance MufflersFlowmaster 817818 Outlaw Exhaust System Kit |
Now hiding additional rows in the Table
About this item
Product details
Compatible with 1967-1972 Chevrolet/GMC K10, K15/K1500, K20, K25/K2500 4WD V8;
This Flowmaster American Thunder dual exhaust system is specifically designed for 1967-1972 Chevrolet and GMC K10, K15/K1500, K20, and K25/K2500 4wd trucks with V8 engines. The system is perfect for the person looking for an aggressive to moderate interior and exterior sound level. Starting at the crossmember-back, the exhaust comes complete with a built-in H-pipe crossover for better exhaust scavenging, all mandrel-bent 2.50-inch stainless steel tubing, a pair of Super 44 Series performance mufflers, and your choice of three tailpipe exits (Turndown behind rear tires, side exit behind rear tires, or straight out the back under the bumper). The system includes all hardware necessary for installation and is covered by our Lifetime Limited Warranty. Fits both short and long wheelbase trucks.;
This Flowmaster American Thunder dual exhaust system is specifically designed for 1967-1972 Chevrolet and GMC K10, K15/K1500, K20, and K25/K2500 4wd trucks with V8 engines. The system is perfect for the person looking for an aggressive to moderate interior and exterior sound level. Starting at the crossmember-back, the exhaust comes complete with a built-in H-pipe crossover for better exhaust scavenging, all mandrel-bent 2.50-inch stainless steel tubing, a pair of Super 44 Series performance mufflers, and your choice of three tailpipe exits (Turndown behind rear tires, side exit behind rear tires, or straight out the back under the bumper). The system includes all hardware necessary for installation and is covered by our Lifetime Limited Warranty. Fits both short and long wheelbase trucks.;
- Crossmember-Back Design Works with Stock Manifolds or Headers, Allowing More Application Options
- 16-Gauge, 2.50-Inch 409 Stainless Steel Pipes add Durability and Strength
- Super 44 Mufflers Deliver Increased Performance and an Aggressive to Moderate Sound Level
- Three Different Tailpipe Exit Options Allow You to Tailor the Look of the Kit to Your Style
- Mandrel-Bent Pipes Help to Maximize the Exhaust Flow for Better Performance
- H-Pipe Style Crossover Helps Exhaust Gas Scavenging and Reduces Drone
- Includes Hangers and Hardware for Installation
- Lifetime Limited Warranty
info:
We aim to show you accurate product information. Manufacturers, suppliers and others provide what you see here, and we have not verified it. Â
Specifications
Vehicle make
Chevrolet, GMC
Vehicle model
K10, K15, K1500, K20, K25, K2500
Vehicle year
1967, 1968, 1969, 1970, 1971, 1972
Muffler type
Performance Mufflers
Warranty
Warranty information
Please be aware that the warranty terms on items offered for sale by third party Marketplace sellers may differ from those displayed in this section (if any). To confirm warranty terms on an item offered for sale by a third party Marketplace seller, please use the 'Contact seller' feature on the third party Marketplace seller's information page and request the item's warranty terms prior to purchase.
Warnings
Warning Text
California Proposition 65
Similar items you might like
Based on what customers bought
Flowmaster Signature Series Exhaust System $1,058.63
$1,05863current price $1,058.63Flowmaster Signature Series Exhaust System
Shipping, arrives in 3+ daysFlowmaster 817659 Crossmember-back System - Force II - 70-73 Corvette - Moderate Sound $1,199.95
$1,19995current price $1,199.95Flowmaster 817659 Crossmember-back System - Force II - 70-73 Corvette - Moderate Sound
Save withShipping, arrives in 3+ daysFlowmaster 817938 American Thunder Crossmember-Back Exhaust System 2.5" 409 Stainless Dual Exit $870.95
$87095current price $870.95Flowmaster 817938 American Thunder Crossmember-Back Exhaust System 2.5" 409 Stainless Dual Exit
Save withShipping, arrives in 3+ daysFlowmaster Signature Series Exhaust System $916.37
$91637current price $916.37Flowmaster Signature Series Exhaust System
Shipping, arrives in 3+ daysFlowmaster Signature Series Exhaust System $888.52 Was $966.60
Now$88852current price Now $888.52, Was $966.60$966.60Flowmaster Signature Series Exhaust System
Shipping, arrives in 3+ daysFlowmaster Signature Series Exhaust System $737.15
$73715current price $737.15Flowmaster Signature Series Exhaust System
Shipping, arrives in 3+ daysFlowmaster 818204 American Thunder Direct Fit Muffler $665.95
$66595current price $665.95Flowmaster 818204 American Thunder Direct Fit Muffler
Save withShipping, arrives in 3+ daysEXHAUST SYSTEM $684.60 Was $767.95
Now$68460current price Now $684.60, Was $767.95$767.95EXHAUST SYSTEM
Shipping, arrives in 3+ daysFlowmaster 817818 Outlaw Exhaust System Kit $614.95
$61495current price $614.95Flowmaster 817818 Outlaw Exhaust System Kit
Save withShipping, arrives in 3+ daysFlowmaster 818196 American Thunder MUFFLER $614.95
$61495current price $614.95Flowmaster 818196 American Thunder MUFFLER
Save withShipping, arrives in 3+ daysFlowmaster 717822 Flow FX Exhaust System Kit $972.95
$97295current price $972.95Flowmaster 717822 Flow FX Exhaust System Kit
24.5 out of 5 Stars. 2 reviewsSave withShipping, arrives in 3+ daysFlowmaster 817819 American Thunder Exhaust System Kit $1,075.95
$1,07595current price $1,075.95Flowmaster 817819 American Thunder Exhaust System Kit
Save withShipping, arrives in 3+ daysFlowmaster 717893 Flow FX Exhaust System Kit $972.95
$97295current price $972.95Flowmaster 717893 Flow FX Exhaust System Kit
Save withShipping, arrives in 3+ daysFlowmaster 718203 Flow FX Direct Fit Muffler $511.95
$51195current price $511.95Flowmaster 718203 Flow FX Direct Fit Muffler
Save withShipping, arrives in 3+ daysBorla 11987 S-Type Axle Back System EXHAUST SYSTEM $847.99
$84799current price $847.99Borla 11987 S-Type Axle Back System EXHAUST SYSTEM
Shipping, arrives in 3+ daysFlowmaster 1041 Header-back System - 3.00 in. Dual Side Exit - Pipes Only No Mufflers $562.95
$56295current price $562.95Flowmaster 1041 Header-back System - 3.00 in. Dual Side Exit - Pipes Only No Mufflers
Save withShipping, arrives in 3+ daysFlowmaster 717829 Flow FX Exhaust System Kit $1,126.95
$1,12695current price $1,126.95Flowmaster 717829 Flow FX Exhaust System Kit
Save withShipping, arrives in 3+ daysFlowmaster 717941 Flow FX Direct Fit Exhaust Muffler Assembly for RAM 6.4 $409.95
$40995current price $409.95Flowmaster 717941 Flow FX Direct Fit Exhaust Muffler Assembly for RAM 6.4
Save withShipping, arrives in 3+ daysNO GENERIC NAME $409.95
$40995current price $409.95NO GENERIC NAME
Save withShipping, arrives in 3+ daysFlowmaster 818171 Outlaw Direct Fit Muffler $460.95
$46095current price $460.95Flowmaster 818171 Outlaw Direct Fit Muffler
Save withShipping, arrives in 3+ days
Popular items in this category
Best selling items that customers love
EXHAUST SYSTEM $1,649.95
$1,64995current price $1,649.95EXHAUST SYSTEM
Save withShipping, arrives in 3+ daysEXHAUST SYSTEM $1,149.95
$1,14995current price $1,149.95EXHAUST SYSTEM
Save withShipping, arrives in 3+ daysEXHAUST SYSTEM $949.95
$94995current price $949.95EXHAUST SYSTEM
Save withShipping, arrives in 3+ daysFlowmaster 1050-FM Flowmaster Header-back Exhaust System $599.95
$59995current price $599.95Flowmaster 1050-FM Flowmaster Header-back Exhaust System
Save withShipping, arrives in 3+ daysFlowmaster 817853 Exhaust System Kit $1,229.95
$1,22995current price $1,229.95Flowmaster 817853 Exhaust System Kit
Save withShipping, arrives in 3+ daysFlowmaster 817917 Exhaust System Kit $460.95
$46095current price $460.95Flowmaster 817917 Exhaust System Kit
Save withShipping, arrives in 3+ daysFlowmaster 817916 Exhaust System Kit $450.95
$45095current price $450.95Flowmaster 817916 Exhaust System Kit
Save withShipping, arrives in 3+ daysFlowmaster 817895 Exhaust System Kit $1,010.45 Was $1,107.00
Now$1,01045current price Now $1,010.45, Was $1,107.00$1,107.00Flowmaster 817895 Exhaust System Kit
14 out of 5 Stars. 1 reviewsShipping, arrives in 3+ daysFlowmaster 425403 Exhaust Muffler $101.95
$10195current price $101.95Flowmaster 425403 Exhaust Muffler
Save withShipping, arrives in 3+ daysFlowmaster 71225 FlowFX Muffler 2.25" Offset Inlet Center Outlet - Moderate Sound 409 Stainless Steel $71.69
$7169current price $71.69Flowmaster 71225 FlowFX Muffler 2.25" Offset Inlet Center Outlet - Moderate Sound 409 Stainless Steel
64.3 out of 5 Stars. 6 reviewsSave withShipping, arrives in 3+ daysFlowmaster 71236 FlowFX Muffler 2.5" Offset Inlet Offset Outlet - Moderate Sound 409 Stainless Steel $71.69
$7169current price $71.69Flowmaster 71236 FlowFX Muffler 2.5" Offset Inlet Offset Outlet - Moderate Sound 409 Stainless Steel
94.7 out of 5 Stars. 9 reviewsSave withShipping, arrives in 3+ daysFlowmaster 72198 FlowFX Muffler 3" Center Inlet 2.5" Dual Outlet - Moderate Sound 409 Stainless Steel $71.69
$7169current price $71.69Flowmaster 72198 FlowFX Muffler 3" Center Inlet 2.5" Dual Outlet - Moderate Sound 409 Stainless Steel
124.5 out of 5 Stars. 12 reviewsSave withShipping, arrives in 3+ daysFlowmaster 71416 FlowFX Muffler 2.5" Inlet/Outlet - Round Body - Moderate Sound 409 Stainless Steel $66.55
$6655current price $66.55Flowmaster 71416 FlowFX Muffler 2.5" Inlet/Outlet - Round Body - Moderate Sound 409 Stainless Steel
94.8 out of 5 Stars. 9 reviewsSave withShipping, arrives in 3+ daysFlowmaster 71419 FlowFX Muffler 3" Inlet/Outlet - Round Body - Moderate Sound 409 Stainless Steel $66.55
$6655current price $66.55Flowmaster 71419 FlowFX Muffler 3" Inlet/Outlet - Round Body - Moderate Sound 409 Stainless Steel
55 out of 5 Stars. 5 reviewsSave withShipping, arrives in 3+ daysFlowmaster 71415 FlowFX Muffler 2.25" Inlet/Outlet - Round Body - Moderate Sound 409 Stainless Steel $66.55
$6655current price $66.55Flowmaster 71415 FlowFX Muffler 2.25" Inlet/Outlet - Round Body - Moderate Sound 409 Stainless Steel
25 out of 5 Stars. 2 reviewsSave withShipping, arrives in 3+ daysFlowmaster 71226 FlowFX Muffler 2.5" Offset Inlet Center Outlet - Moderate Sound 409 Stainless Steel $71.69
$7169current price $71.69Flowmaster 71226 FlowFX Muffler 2.5" Offset Inlet Center Outlet - Moderate Sound 409 Stainless Steel
104.9 out of 5 Stars. 10 reviewsSave withShipping, arrives in 3+ daysFlowmaster 71235 FlowFX Muffler 2.25" Offset Inlet Offset Outlet - Moderate Sound 409 Stainless Steel $71.69
$7169current price $71.69Flowmaster 71235 FlowFX Muffler 2.25" Offset Inlet Offset Outlet - Moderate Sound 409 Stainless Steel
25 out of 5 Stars. 2 reviewsSave withShipping, arrives in 3+ daysFlowmaster 71229 FlowFX Muffler 3" Offset Inlet 3" Center Outlet - Moderate Sound 409 Stainless Steel $71.69
$7169current price $71.69Flowmaster 71229 FlowFX Muffler 3" Offset Inlet 3" Center Outlet - Moderate Sound 409 Stainless Steel
94.7 out of 5 Stars. 9 reviewsSave withShipping, arrives in 3+ daysFlowmaster 17107 Header-back System - 2.50 in. Dual Rear Exit - Pipes Only No Mufflers $562.95
$56295current price $562.95Flowmaster 17107 Header-back System - 2.50 in. Dual Rear Exit - Pipes Only No Mufflers
14 out of 5 Stars. 1 reviewsSave withShipping, arrives in 3+ daysFlowmaster 74151 FlowFX Muffler 3.5" Center Inlet/Outlet - Moderate Sound 409 Stainless Steel $104.95
$10495current price $104.95Flowmaster 74151 FlowFX Muffler 3.5" Center Inlet/Outlet - Moderate Sound 409 Stainless Steel
25 out of 5 Stars. 2 reviewsSave withShipping, arrives in 3+ days
Customer ratings & reviews
0 ratings|0 reviews
This item does not have any reviews yet
Related pages
- Flowmaster Outlaw Axle Back Exhaust
- Flowmaster Mufflers
- Magnaflow Mufflers
- Flowmaster Collection
- Flowmaster Outlaw Cat Back
- Flowmaster Flowmaster Collection
- Brand: Magnaflow Performance Exhaust
- Flowmaster Outlaw
- Magnaflow Exhaust Systems
- Magnaflow Exhaust Tips
- Flowmaster Exhaust Systems
- Exhaust Systems & Mufflers










