I don't think changing exhaust would be the answer

 

then what can it be

 

can this be it

That cam has a LOT of exhaust duration, it may have been purpose-designed for a more restrictive exhaust.

 

you should really ask patrick. when he spec'd you the cam did you tell him you were goin to run dual exhausts?

something is definately wrong because i ran mid 11's with a 5.3 and 150 shot.

 

i check my sheet and i put dual 3 inch x pipe so i dont know where the problem stands

 

I know this sucks but it's kinda interesting. I would suggest, since it's easier to swap the exhaust back to do that and go back to the track. If it does better or worse it will tell you if it was your cam or not.

 

yea that's what im probably going to get done by the week end and take it to the track next wed, ill keep yal posted to see if theirs a diff , i hope so

 

y is that u think that ? im curious , whats you all's opinion's on the exhaust

 

Some people think 3" duals is too big and not enough restriction. However...I have a 3" x-pipe and open headers out both sides of my truck and it only made 4 rwhp more than when I closed the cut-outs and went into a 2-1 muffler a resonator and out a single 3" tip.

 

okay so let me get this strait. gt2 can with the radix and that converter you have went faster?.... and now with the larger cam it goes slower.

is the converter "loose" or tight? that converter may be hurting you.


i would ditch the PI and get something that has a higher str.

and drop that crazy 4k to maybe a 3600.