I had the stock h pipe and slp lm 1s, well you see this set up was loud but just not what i expected. So I order the UPR o/r x pipe...and OMFG my Mustang now sounds like a ****in nascar! It is literally insane!! It makes everyones head turn. I have gotten plenty of thumbs up and head nods, but i have also gotten those bitches that hate life shake their head at me and hold the arms out...**** them. Well just thought I would share my amazing story of how much mid pipes change sound lol.