I have BBK Equals, they are a pain like others have said, but they were on the car when I got it. If you are solid on getting shorties, get the unequals, ceramic coated from either BBK or FMS. Longtubes will have the best performance gain if you decided on going with them. H-pipes tend to have the deep, throaty sound while the X-pipe tends to be a little on the revvy, raspy sound. The muffler will also effect the sound greatly, stay with chambered mufflers on the H-pipe and bullet style muffler with the X-pipe.