Here is the setup I am looking into: SLP 1 5/8" Headers, CarSounds Cat, and Random Technology Exhaust. Does anyone else have a setup like this? What kind of HP game can I expect? Remember I still have stock exhaust. I currently dyno 183.2 RWHP and 213.8 RWTQ.

 

Do you ever plan to move up in cubic inches?If so get the 1 3/4" headers so you don't have to buy them later when you build that motor.Spend the money once.You will need the cat adapter i'm afraid,but the cat your getting should slide right onto that.The cat adapter is curved to aim the y pipe at the cat otherwise the y pipe runs straight back along the rocker and stops,leaving you no choice but to buy the adapter.Gotta love SLP!Otherwise sounds like a nice setup,I had the Random Technology cat-back on my Z,LOUD as all hell.