Originally Posted by red6spd

I'm going to explain this a little bit more because I don't think the OP understands the importance of a tune with all those mods. Yea you will creep out a few hp more and have your CEL turned off but the biggest reason is to make all those mods work together with your Z. The Z tends to run on the lean side with all those mods and a tune really cleans it up. A good tuner should be able to show you how messed up your AFR is and how a tune can clean it up.