Hey guys i want to prep my car before i go buy a zzp stage 2. Alright the current mods i have done to my car are K&N Intake, Custom 2.5" Duel exhaust and a ZZP Heat Exchanger. Im still running the stock pulley and stock tune but i want to prep my motor so i can get them most out of it. The setup that i want from ZZP its the 42# Injectors and the 2.9" pulley. Should i get a LS4TB since there tuning it anyway and why not meth to but idk if its a good idea since im only goin to be running the 2.9.

 

i mean imo you already got a exhaust and cooling you will be ok. Motor wise youll def be fine ecotec's are damn near bulletproof. The only thing id say get it a custom tune

 

forget about the ls4tb, not needed

i didnt read anyhting about you having a downpipe, thats the mose restrictive part of your exhaust.
i would get a 2.5 downpipe w/highflow cat, and if you have enought cash, header too 1.5 primary, unless you think you will be modding more, then 1.75 primarys

 

I personally like the 3" DP with the 2.5" catback for cars that are running a 2.7 and higher.

 

Don't worry about the LS4 tb. If you really want to mess with you tb, just port it. Get a header/downpipe and you'll be set. Your cooling mods should be fine for that setup so I wouldn't worry about meth right now if I were you.

 

but meth is the **** if you want it go for it