I pressed the EZ button myself with a Jegs and Summit exhaust kit before. Well worth the price with minimal pipe cutting involved. Fit between both kits was excellent and even better considering there inexpensive pricing.
The first kit I purchased was from Jegs. It was the complete kit. A minor trim at the rear bumper was all that was needed. This is a ‘08 video;
The new kit is from Summit which also included mufflers.
I also have, but not installed the H pipe. That will wait for when the drive train is installed and otherwise, ready to rock.
The mufflers supplied with the kit neck down inside. So I went and purchased the Summit brand turbo mufflers that do not neck down inside. The sound difference can be heard somewhat in the video. As I pass the first supplied set of mufflers, you can hear the tin sound they have through the muffler body. The second set at the end have a more husky thump though not a 100% true sound to them as the first set has changed the note a good bit. Without the first set of mufflers up front, the second set looses the fart sound. A more authoritative deep pounding sound.
The H pipe when installed should knock out a few scant decibels but help overall in power without loosing the pipe to pipe pulse to much of the true dual exhaust set up. The X like shares the exhaust pulses so well that the exhaust sound is shared so well it looses that heavy thump that bounces from pipe to pipe like the old days. Up top in the RPMs of a WOT run, the X pipe just simply shreaks like a Banshee! (Really cool IMO!)