on mossmustangs.com they have the frpp exhaust and the 4" tips are $309, but the 3.5" are $399. I was wondering what is the difference between the two and is the $399 worth it?

 

One should be a direct replica of the borla stingers and one should be a more traditional oval style muffler. But from the sounds of it it should be a pretty good deal unless its 399 for the oval style. Hop on it.