This morning I took out my leaky MAC H-pipe and put in my MAC Prochamber. The wierd thing is that the prochamber is actually louder than the hpipe-I would have thought that it would have been the other way around. I love the deep throaty sound and I would recommend it over a traditional h-pipe any day. The only drawback is that it vibrates my e-brake lever which is pretty annoying. Does anyone have any ideas on how to fix that?