okay, so i have a 03 Z. I have a stillen catback,berk test pipes,JWT popcharger,and a 5/16 iso thermal spacer. what are all the pros and cons of a tune and what kind of tune should i get? Also any hp ideas of before and after, with a tune with my setup?

 

jebus christ........the post right below is the exact same question.

 

Haha

 

if these are going to be your last mods then get an osiris tune. You can see maybe a 15-20 hp gain. But if you have future plans for more mods then just wait till after those are done

 

15-20 is way too high.......more like 8-10whp unless your car is completely abnormal.