Yoshi R77's versus Akrapovic 4-2-1

[fasterfaster]

If your not going to re map it after fitting then your probably best to just spend your money on a remap with the stock system as you will gain more than running a system un mapped. The o2 sensor will adjust your idle and light cruise fueling only and once open loop condition ........................ it's effect is zero. Stock bike is allready fuelled way rich and fitting system will make it even more so. If you only want noise and weight loss for your dollars spent then no prob, if you want the results for your money spent ................... tune it.