Go through the discharge M4 stock on the bubble. Good looks and weight loss is quite dramatic, almost 10 pounds! Ear plugs are a must, but it's worth the compromise as the bike sounds fantastic! In terms of performance, I noticed no drop in the low to mid range, so using it for the very restrictive muffler and CAT. Until the end than I am sure there are some improvements, but it is difficult to say with so much power on tap water!
Keywords: GSXR1000, GSXR-1000, K8, Stock, Exhaust, M4, Slip, on, motogp, Loud
