As for remapping.. Depends if you want to have an edge on standard 330s... You won't get huge gains by remapping but it will improve performance wise.. I'm guessing at 15-20bhp gains, but that's just a guess :hehe
Forum Vendor AP gtuning says he can get 15bhp from a map.
Combine it with a performance air filter you could be pushing over 250bhp - I'm saving for a tuning kit atm know a guy who does it for £500 will report back after it's been on the rollers
general consensus appears to be they don't do much good - if you go top end they might add a few bhp but the induction noise is pleasant especially in a vert
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