I had an r77 Yoshimura slip on. Ever since I installed it, my bike felt seriously dead anywhere below 4k rpm. This was with the silencer too (i figured it might've helped back pressure).

Well man, my bike runs _so_ much better in the low end with the stock exhaust back on.

Guess I need to wait for a power commander, but I wonder if low end torque will ever be better then a stock system.

 

I installed two brothers and their juice box pro. Works really well.Bike feels stronger at low than it did stock.My bike before pipe and juice box felt weak until at least 5000 on tach.Now it pulls strong starting at 3000.I also installed a zbomb which gives the upper power past 10500.