You can do a Cobb stage 2+ sleeper. Just hide your FMIC behind the grill, do DPs, drop-in, N55 mids, and keep the stock axle back. Car is still really subtle unless you go WOT. You can do the same setup with JB4 as well. IMO "just a tune" isn't the best way to go. Stock FMIC and DPs should be changed with a tune IMO.
Since you mentioned a Z, I was driving my buddies HR today and that thing is always loud. Totally different animal.
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