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So im wanting to keep my manifolds cause of smog visual reasons. How much Hp would i gain from headers compared to a stock z06 exchaust gutted? Ended up swithcing my YSI to a vortech V3 unit to reach my 800whp Goal on dual nozzle meth 427 heads and cam 11;1 compression. Should i run a 10% lower and a 3.7 upper? ill be shifting around 6800.
My guess is the headers will cost you at least 25whp at those levels. I haven’t seen any comparisons from those that have actually tested it, though. Pulley sizes seem about right.
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Headers Vs Z06 manifold
