Ok, thanks guys. One thing I just saw is the the new Slimline Q series is only 2.5 oz, opposed to the combined weight of 8oz for the stock muffler and adapter. It is my understanding that muffler volume equates to more power, but maybe almost a half pound of weight is worth losing a few rpm. The Bisson is just over 4oz, so if I'm going to pick one of the two, I'd go with weight savings since there is no cut and dry evidence that the Bisson is better.