|
I have a speedwerx pipe and can on my 2007 m8 and it definitely added HP, but I also have a boondocker and high compression head. I have a sno stuff rumblepack on my 2001 summit 800, couldnt really tell if it added HP (feels like there is a slight boost at WOT), but it definitely helped drop weight. The rumblepack noise levels are borderline obnoxious (I like it though), where as the speedwerx have a slightly different sound but they arent really any louder
|