To the OP. I have 3 mods. Nismo cat-back,Popcharger,and 5/16" spacer. Spent 1300 on all that. Pretty happy with it now, and am content to let it be. A good starting point would be your basic I/E. Then go from there. Ref this thread: https://my350z.com/forum/engine-and-drivetrain/50429-new-350z-owners-read-this-before-doing-any-modifications-to-your-z.html