im going to install my rear diffuser that i purchased from thezstore.com a week or so ago and tomoro i pick it up from the paint shop...im also putting hks hi power true dual on and i m worried that the 4 1/2 inch tips or so on the exhaust will rub against the diffuser and either cause it to crack or damage it in another way due to heat...has anyone had problems concerning this..or think that it is problem prone?

 

I haven't had any problems with mine. it sits about 1/4 in away from my carbon fiber diffuser and I'm not even sure if it ever even touches the diffuser.

 

And why the hell do you need 4 1/2 in tips for. Are you boosted at all?