I currently dyno 350rwhp and and 339rwtq with Hooker shorties/2 1/2" Y-pipe/stock gutted cat/stock Ipipe/Flowmaster muffler.
Engine is stock headed with larger LT4 valves, cc306 cam, Type Rs, CC986 springs, 1.6 GMPP rockers, 11.8:1 compression, 24lb SVOs, 52mmTB, LPE CAI, and Madwolf/Dyno tuning.

Last dyno run, we let off at 5600rpm because motor was new, but HP was still climbing. I like to shift around 6400rpm while I am running stock replacement timing set.

Any ideas?

 

TTt

 

You'll probably pick up another 20 horses to the ground.

An xpipe wont get you any more power over a 3inch Y pipe.. but getting rid of that stock ypipe for anything will get you more power..

 

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