SPELAB Exhaust Header for Chevy 283/302/305/307/327/350/400 Duramax Intercooler Pipe An aftermarket downpipe will typically

An aftermarket downpipe will typically be larger in diameter and either uses a high-flowing catalytic converter or remove the catalytic converter altogether

A1: The bottom of the main body is made of stainless steel

7L Chassis-Cab Only (Also Fits Dual-Alternator Engines)

How to Ensure a Perfect Fit

7L Powerstroke engine recirculates exhaust gas into the intake to reduce NOx emissions

SPELAB Exhaust Header for Chevy 283/302/305/307/327/350/400 Duramax Intercooler Pipe An aftermarket downpipe will typicallySPELAB Exhaust Header for Chevy 283 302 305 307 327 350 400 Replacing or upgrading your exhaust header is necessary for both engine performance and sound. Whether on or off the track, exhaust headers provide more horsepower and improved exhaust sound. SPELAB offers many products to help you create your own custom engine headers. It's really easy and convenient to use: direct bolt on, no modification needed. Fitment: Chevy 283 302 305 307 327 350 400