Steeda has a video comparison of stock vs their h vs their x. This is how I settled on the steeda x pipe
I think it comes down to personal preference... I first went with a muffler shop res delete and their own fabricated x pipe. Noticed what felt like a little more oomph wot but raspy. So, had a shop swap out the x for their own fabricated h pipe. Sounded great down lower rpm's (deeper tone) but felt sluggish like the exhaust was not flowing out as smoothly. So, I decided what the heck, and ordered an x pipe from Steeda. Big long box arrived on the front steps and the wife asked what it was.... Told her they were spatulas for my smoker LOL! Anyway, Love it. For me, the Steeda x pipe was a game changer for my Mach 1. To my ears, not raspy but instead growly. And, with the auto rev matching, downshifting at intersections creates a nice "bark" but not in a stupid annoying way. Side note, with active exhaust, I had to set it to quiet mode for cold starts because in any other mode it is very loud on cold start.
