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What are some simple bolt on's that will give me those extra horses! I already plan on getting the Halltech Venom. Any other things I can slap on without having to re-tune my Z?
Vararam vrb2 is pretty much considered the best "bang for the buck" cai system. Long tube headers, hiflow cats, performance exhaust, etc.. are all good boltons, but will need a tune to realize their full potentials.
If you don't want to go to a pro tuner, consider purchasing a Diablo Predator handheld tuner, or equivalent, and you can add a nice performance tune yourself. You can also dial in your fuel trims, which will change whenever you add cai, headers, etc., and you can also change other variables. They are very user friendly, and the DiabloSport website offers plenty of help and guidance.
I bought a used one from a fellow corvetteforum member. If you choose to do this, be sure that the one you purchase is "unlocked" and the correct model for your car (model U7198).