1K RPM seems a little high...wow!!! Seems that I only saw about 300 - 400 increase. The main reason I went back to the stock muffler was the noise level...I like them as quiet as possible...the MACS pipe was a little obnoxious. But if you're reporting a 1K increase I'll try it again tomorrow.

My 50SX on my 4.25lbs OMP Edge 540P is very easy to imagine...take the above picture, pretend that your holding my radio and you give it full throttle, 20-30 seconds later it's a little dot way up there, then you get to flat spin it all the way to the ground...he he he!!! Lovin my Edge 540P!!!

-DRW