I'm running a GT 2560 turbo and a efficient 4 into 1 header on my RX1 mountain. The way I have it clutched it's only getting to 9800 rpms. I'm running 17 # of boost and it runs real strong but am wondering how much more hp I would have if I clutched it to about 10800 rpm. Would it be noticeable or should I leave the r's where there at and see if this helps the longevity of the engine? Thanks, Ken....