I hear conflicting things about the decat pipe - some people say it gives better response and a few more bhp, some say it just improves the responsiveness, some say it does nothing for performance at all.
Everyone agrees it will be noisier
I'd be surprised if a Milltek with the silencers still intact troubled a noise meter even with a decat though?
The wheels are such a classic design I couldn't pass them up. As for brake cooling they're well proven in competition so hopefully won't be a problem.