a couple months back i posted about installing a stealth muffler system on my atv. after useing now for awhile,i am having second thoughts .yes,it is quieter by half,but performance seems to be lacking and plugs are wanting to load up faster with carbon.when i trailered it sat. there was a pile of soot that fell from the end of the pipe. also the fumes seem to be much worse when in operation.has any one experianced similar conditions with this product ?Thanks*