Well I am not sure which tips to get. I want a at least 3" tips however I am worried about them melting my rear diffuser (Dynamic trim kit). If anybody can give me advice on what diameter size that would be awesome. S40Racer's tips are 4", I am wondering if he had to modify his bumper.
Here is the one I have my eye on. These can be 3-4" in diameter. Give me suggestions guys!