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Flowmaster's American Thunder crossmember-back exhaust system for the 1967 - 1972 GM C10/C15 1/2 ton 2WD (Coil Spring) pickup truck is perfect for the person looking for moderate to aggressive sound levels with all of the performance benefits that you would expect from Flowmaster. This crossmember-back DOR/DOS (Dual Out Rear, Dual Out Side) system features dual Super 44 Series mufflers, 2.50 in. mandrel bent 409S stainless steel tubing and all the hardware necessary for a great fitting installation. (Stainless tips sold separately). This system is routed in a fashion that accommodates both long and short wheelbases with automatic or manual transmissions, and provides adequate clearance for substantially lowered vehicles. The exhaust system is covered by Flowmaster's Lifetime Limited Warranty.
| Exhaust Series | American Thunder |
| Exhaust Type | Dual |
| Exit Position | Dual Out Side |
| Exit Position | Dual Out Rear |
| Exit Style | Straight |
| Heat Shield Attached | No |
| Inlet Diameter | 2.500 in. |
| Inlet Inside Diameter | 2.500 in. |
| Material | Stainless Steel |
| Muffler Count | 2 |
| Muffler Part Number | Kit Only |
| Muffler Series | Super 44 Series |
| Outlet Diameter | 2.500 in. |
| Outlet Outside Diameter | 2.500 in. |
| Single or Dual | Dual |
| Sound Level | Moderate/Aggressive |
| System Type | Header Back |
| Tail Pipe Diameter | 2.500 in. |
| Tip Quantity | 0 |
| Title | Flowmaster 817654 Crossmember back 409S - Dual Rear or Side Exit - Moderate/Aggressive Sound |
| Tubing Diameter | 2.500 in. |
*Some manufacturer restrictions apply.
Manufacturer of performance exhaust systems, mufflers, cold air intakes, turbo boost modules, catalytic converters, race mufflers, headers and numerous exhaust accessories for late model cars, trucks, off-road, Jeeps, SUV’s, classic muscle cars, powersports vehicles and more. Flowmaster® gives you lots of exhaust choices with 12 designs of chambered mufflers, 3 styles of our exclusive “laminar-flow” mufflers and a new line of FlowFX “straight-through” performance mufflers, along with 5 sound categories of exhaust systems, giving you the customer, the power to custom tailor the sound of your vehicle whether you prefer mild, moderate or aggressive tones and sound levels.
An upgraded exhaust system is one of the easiest modifications that offers an immediate, noticeable performance improvement. Whether you’re cruising an M3 or modding a diesel truck, an upgraded exhaust will open up the restrictive factory system, allowing your engine to breathe better and deliver peak power! From lighter weight exhaust headers to improved cat-back systems, to better sounding mufflers, modifying your exhaust setup is a great place to express the character of your ride in a unique and cost effective way. Whatever you’re looking for in a modified exhaust system, we can provide the absolute best systems to make your vision a reality.
Based in California with 3 warehouses across the country, we’re sending out shipments everyday of the week, even Saturdays. Because your next mod shouldn’t have to wait.
The best modders use Wheelwell to build their dream rides.
