Inliners International Forums General Discussion Engines Need to know exhaust pipe diameter for GMC 302.

Sidehill,
The stock exhaust size is 2-1/2". If you kept the 2" pipe I think you would be restricting the engine. The 302 is an engine that needs to BREATH. When I installed the 302 in my 1/2 ton GMC, I sent the stock manifold to Kansas Kustoms and had it split for dual exhaust. Nice thing was that I already had one pipe out the back and all I had to have the muffler shop do was add another(cheaper). With the short dual Smitty's, it sure sounds sweeeeeeet.