Hello guys, I have a 80cc motor that i purchased frm Bikeberry, it performs great. So great that I purchased a second complete kit to use as a part kit. The second kit is EPA certified for 2009, and i was able to look up the cert on the EPA website. Anyway, I decided to replace the chrome muffler that came with my first kit with the black cat muffle from the second kit. Ive noticed a couple of things before, duriing and after the ride. The black cat muffler manifold pipe is longer anf it is much heaviere, and it seems to let the engine breathe easier therefore noticable torque increase, and it is slightly quieter, last the catalyst inside makes that muffler hot enough to cook a steak on it . Has anyone noticed a performance difference between the two types of muffler?