Ive got a 1993 gmc sierra that has a 5.7L 350 engine and it currently has the stock cast iron manifolds, and im looking to replace them with a shorty header of equal length tubes if they will offer any better sound or performance increase. I do currently have high flow cats and a single chamber muffler which flows great and is loud, im just looking to see if replacing the manifolds would be any help.
http://www.streetperformance.com/part/dorman-hpx/exhaust-manifold/1145565-674-157.html
I would go and get long tubes but i live in california so i would have to tune and adjust the exhaust to keep it legal which would just bring the performance back to what shorties would be.
any good aftermarket shorty should give you a little power increase, it might give you a little more sound, but if you have an exhaust it wont do much, if you get ceramic coated headers they allow heat to dissipate faster so it stays cooler
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