What kind of power and torque should I expect to see at both the wheels and crank with the following mods.

Ls4 tb with spacer
Magnaflow cat back
Aem cold air intake
Stage 2 tune with Nate's 2.9
Heat exchanger
Mild port of blower and plugged silencer holes

 

245 whp?

 

I would say 238whp... probably about 260 hp at the crank. Without a tune you are not taking advantage of most of your mods.

 

x2...

 

get Area to tune it, that set up is similar to mine and i made 264whp 232wtq

 

With no tune, those mods may just hurt you.

 

forget the LS4 TB, you're going to need some serious tuning

rest of the list is fine

 

indeed, nearly pointless without a tune

 

No serious tuning needed but you cannot run the ls4 without changing a few things and the scaler.

So add a custom tune otherwise you'll be taking the ls4 off the mod list. With the rest of the mods you still won't be taking advantage of them. 240whp on a good day.