A month ago I bought a Pro Circuit 304 silencer for my 98 KDX 220R and am running the stock pipe. I am going to buy a new pipe and was wondering which pipe to purchase. The obvious choice would be the pro circuit, but is it possible to use an FMF pipe with a pro cicuit silencer. Is there any one out there running this combination. Our should I go with the pro circuit. Is there any advantage to an aftermarket pipe or is the stock as good as anything. Any input would be appreciated.:cool: