[KingLT1]

The only thing that really needs to be addressed is the primary cats. Even then if the tuning is correct you can make a bit more than 600whp with no issues on stock exhaust. Laynlo and toohighpsi have both made over 700whp on bone stock NPP exhaust. Some have melted the cats with less power, but again tuning and how much excess fuel is dumping into the cats will play a factor.

I am also getting ready to install my Whipple. My setup will consist of: CA performance cat deletes(retaining the secondary), Rotofab dry, Ported TB, LT4 Injectors, LPE HPFP, ZL1 intank, and JMS booster.

I really like the CA delete pipes with secondary in place. In touring the exhaust is nice and quiet, in sport it is a bit louder and screams pretty loud at WOT. No drone either way. The issue is finding the delete pipes. Nobody is currently making a set that bolt's in and retains the secondary.

I do think a set of TSP 1 7/8 with high flow cats would get you what you want either way. The main thing is to have a high flow cat or resonator pre muffler for added sound control.