Hmmm....even with a rear diffuser installed, the tips may be sticking out too much. I knew I was getting a diffuser so a exhaust with adjustable tips was an absolute must for me.
Go here to see close-up pics of my JL-Motoring diffuser. You can see an approximate length that the diffuser extends the rear bumper.
http://www.m3post.com/forums/showthr...oring+diffuser