The system i installed was from expand=ex in des moines, iowa it fit really good and i have nooooooooooo muffler and it does have some rumble when you stand on the loud pedal, but cruising down the road at 60mph it is alot quiter than my old 4" system. it took me and my brother about 1hr and a half to install from turbo to tailpipe and made my own hangers. i am very happy with the sound and lower egt's. Oo.