Just purchased the 840 kit from four stroke tech. I need an exhaust to go with it. I can't find any reviews on the dual yoshimura set up but would like to know about it. I know the Muzzy's super but I think maybe a bit loud even with the whisper cores....(100db?). I am looking for the best compromise between power and noise. Will the hmf swamp series work?...they are around 94db at 5000rpm they say?