I just took my baffler off today, and I must say the performance gain is phenomenal! I have a jackshaft kit and before I took off the baffler it didnt really utilize the gears good. But now IT HAULS A**. I can get up to 35mph in about 10 seconds, and the acceleration is LOVELY. The only thing is that it can get a bit loud. Really and truly I would recommend a Tuned pipe, or expansion chamber b/c you will be able to harness this effect, and still utilize back pressure at high RPM's. SICK BIKE PARTS RULE!!!