On a 94-98 body style 4 inch tip may look good..but on a 99-04 without gt back bumper 4 inch tips are a no no IMO.

 

Go ahead and replace your front crank seal while you have it all apart.

 

Yeah if I had a gt bumper I would have gone 3.5 or 4 but you can only put something so big out under the stock bumper. I think I'm going to go ahead and order the udp and belt by the end of this week either from stangmods or autobadges.