I would really like to get an LRD exhaust fro my 400EX but I ocasionaly ride on som land behind my house and other little local places were sound would be a problem. I am wondering if there would be some way to make a new silencer core to quiet it down when not racing. I was thinking a cone that narrowed back down at the end and also have it square like the new FMF. It would cut power quite a bit but at least I wouldn't have to change back and forth from stock.