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.
| Description_ABR |
SYS 67-72 GM |
| Description_SHO |
SYS 67-72 GM TRUCK 4 |
| Description_INV |
67-72 GM TRUCK 4WD AMT XMB DOS/R |
| Description_ASC |
Manifold down pipes and header reducers not included. Fits both long and short bed trucks. |
| Description_DES |
Flowmaster American Thunder Crossmember-Back Exhaust System |
| Description_EXT |
Fits 1967-1972 Chevrolet/GMC K10, K15/K1500, K20, K25/K2500 4WD Trucks with V8 Engines, 2.50" 409 Stainless Steel |
| Description_MKT |
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. |
| Description_FAB |
Crossmember-Back Design Works with Stock Manifolds or Headers, Allowing More Application Options |
| Description_FAB |
16-Gauge, 2.50-Inch 409 Stainless Steel Pipes add Durability and Strength |
| Description_FAB |
Super 44 Mufflers Deliver Increased Performance and an Aggressive to Moderate Sound Level |
| Description_FAB |
Three Different Tailpipe Exit Options Allow You to Tailor the Look of the Kit to Your Style |
| Description_FAB |
Mandrel-Bent Pipes Help to Maximize the Exhaust Flow for Better Performance |
| Description_FAB |
H-Pipe Style Crossover Helps Exhaust Gas Scavenging and Reduces Drone |
| Description_FAB |
Includes Hangers and Hardware for Installation |
| Description_FAB |
Lifetime Limited Warranty |
| Description_ABR |
SYS 67-72 GM |
| Description_SHO |
SYS 67-72 GM TRUCK 4 |
| Description_INV |
67-72 GM TRUCK 4WD AMT XMB DOS/R |
| Description_ASC |
Manifold down pipes and header reducers not included. Fits both long and short bed trucks. |
| Description_DES |
Flowmaster American Thunder Crossmember-Back Exhaust System |
| Description_EXT |
Fits 1967-1972 Chevrolet/GMC K10, K15/K1500, K20, K25/K2500 4WD Trucks with V8 Engines, 2.50" 409 Stainless Steel |
| Description_MKT |
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. |
| Description_FAB |
Crossmember-Back Design Works with Stock Manifolds or Headers, Allowing More Application Options |
| Description_FAB |
16-Gauge, 2.50-Inch 409 Stainless Steel Pipes add Durability and Strength |
| Description_FAB |
Super 44 Mufflers Deliver Increased Performance and an Aggressive to Moderate Sound Level |
| Description_FAB |
Three Different Tailpipe Exit Options Allow You to Tailor the Look of the Kit to Your Style |
| Description_FAB |
Mandrel-Bent Pipes Help to Maximize the Exhaust Flow for Better Performance |
| Description_FAB |
H-Pipe Style Crossover Helps Exhaust Gas Scavenging and Reduces Drone |
| Description_FAB |
Includes Hangers and Hardware for Installation |
| Description_FAB |
Lifetime Limited Warranty |
| Brand |
Flowmaster |
| California Proposition 65 |
Yes |
| California Proposition 65 Chemical Name |
Nickel (Metallic) |
| California Proposition 65 Chemical Name |
Chromium (hexavalent compounds) |
| CARB (California) Compliant |
Yes |
| Catalytic Converter Included |
No |
| 2874 |
0 |
| Category |
Exhaust |
| 3728 |
Flat Band |
| 1882 |
Yes |
| Emission Code |
5 |
| Exhaust Series |
American Thunder |
| 1161 |
0 |
| Exhaust Tip Quantity |
Sold Separately |
| 10980 |
Round |
| 9870 |
Dual Out Side |
| 9870 |
Dual Out Rear |
| 200 |
Natural |
| 353 |
No |
| 3390 |
Performance |
| 4364 |
Yes |
| Heat Shield Included |
No |
| 596 |
Weld-On |
| 9871 |
2.50 |
| Mount Type |
Uses New Hangers (Included) |
| 92 |
Yes |
| 11021 |
4.00 |
| 11022 |
13.25 |
| 11023 |
9.50 |
| 11064 |
Chambered |
| 11048 |
4.00 |
| 11049 |
13.25 |
| 11050 |
9.50 |
| 11073 |
Chambered |
| 9884 |
4.00 |
| 1892 |
13.25 |
| 4372 |
409 Stainless Steel |
| 4373 |
Oval |
| Muffler Color |
Black |
| 9882 |
Black High-Temperature Paint Finish |
| 4367 |
No |
| 4368 |
No |
| Muffler Included |
Yes |
| 9962 |
Slip-Fit |
| 4365 |
2.50 |
| Muffler Inlet Location |
Offset |
| 4366 |
2.63 |
| 9963 |
Slip-Fit |
| Muffler Outlet Diameter |
2.50 |
| 4375 |
1 |
| Muffler Overall Length |
19.50 |
| Muffler Part Number |
Kit Only |
| 4374 |
2 |
| Muffler Series |
Super 44 |
| 1174 |
Reflection |
| part type |
Exhaust System |
| 3530 |
409 Stainless Steel |
| Product Type |
Exhaust System |
| Sound Level |
Aggressive / Moderate |
| 4377 |
No |
| Sub Category |
Exhaust and Tail Pipes |
| 4369 |
2.50 |
| 4376 |
2 |
| Tail Pipe Quantity |
Dual |
| 4370 |
No |
| Type |
Crossmember-back |
| 6014 |
No |
| 2126 |
Not Applicable |
| Warning |
California Proposition 65 |
| Pipe Color |
Silver |
| 9885 |
9.50 |
| Brand |
Flowmaster |
| California Proposition 65 |
Yes |
| California Proposition 65 Chemical Name |
Nickel (Metallic) |
| California Proposition 65 Chemical Name |
Chromium (hexavalent compounds) |
| CARB (California) Compliant |
Yes |
| Catalytic Converter Included |
No |
| 2874 |
0 |
| Category |
Exhaust |
| 3728 |
Flat Band |
| 1882 |
Yes |
| Emission Code |
5 |
| Exhaust Series |
American Thunder |
| 1161 |
0 |
| Exhaust Tip Quantity |
Sold Separately |
| 10980 |
Round |
| 9870 |
Dual Out Side |
| 9870 |
Dual Out Rear |
| 200 |
Natural |
| 353 |
No |
| 3390 |
Performance |
| 4364 |
Yes |
| Heat Shield Included |
No |
| 596 |
Weld-On |
| 9871 |
2.50 |
| Mount Type |
Uses New Hangers (Included) |
| 92 |
Yes |
| 11021 |
4.00 |
| 11022 |
13.25 |
| 11023 |
9.50 |
| 11064 |
Chambered |
| 11048 |
4.00 |
| 11049 |
13.25 |
| 11050 |
9.50 |
| 11073 |
Chambered |
| 9884 |
4.00 |
| 1892 |
13.25 |
| 4372 |
409 Stainless Steel |
| 4373 |
Oval |
| Muffler Color |
Black |
| 9882 |
Black High-Temperature Paint Finish |
| 4367 |
No |
| 4368 |
No |
| Muffler Included |
Yes |
| 9962 |
Slip-Fit |
| 4365 |
2.50 |
| Muffler Inlet Location |
Offset |
| 4366 |
2.63 |
| 9963 |
Slip-Fit |
| Muffler Outlet Diameter |
2.50 |
| 4375 |
1 |
| Muffler Overall Length |
19.50 |
| Muffler Part Number |
Kit Only |
| 4374 |
2 |
| Muffler Series |
Super 44 |
| 1174 |
Reflection |
| part type |
Exhaust System |
| 3530 |
409 Stainless Steel |
| Product Type |
Exhaust System |
| Sound Level |
Aggressive / Moderate |
| 4377 |
No |
| Sub Category |
Exhaust and Tail Pipes |
| 4369 |
2.50 |
| 4376 |
2 |
| Tail Pipe Quantity |
Dual |
| 4370 |
No |
| Type |
Crossmember-back |
| 6014 |
No |
| 2126 |
Not Applicable |
| Warning |
California Proposition 65 |
| Pipe Color |
Silver |
| 9885 |
9.50 |
