0 tuning.. and yes this is a bolt-on system, utilizing the factory hangers, everything you'd expect. As with most bolt-ons of this nature, tuning will only stand to have additional increases, depending on the combination of the parts installed, and of course the tuning.
We've had extensive R&D time on the Z's and G's, and put that knowledge to the 370Z. 18hp is a significant gain, and was achieved through exhaustive testing, and the knowledge of these cars/engines.
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