This is the MZ 65 on the same stocker as previous video just dialed in a bit better.I really did this video to prove that even a properly setup stocker could climb and accelerate up a steep grade.it's the same hill I ran the 48-50cc up,the pipe allows good flow to accelerate and pull pretty hard again I don't find the hit very hard but it's noticable, it didn't even get on the pipe here it was about too as It started to level out but I lifted because my point IMO anyway was made LOL.So yes as a bolt on for stock to mild engines this pipe is pretty good.Though I must say I'm suprised because they don't do a very good job of putting it together and the chamber really is just an enlarged banana with an extended divergent and actual header/stinger.