I have an FMF Powercore II silencer on my '01 300 MXC and am happy with results. Compared to stock, it's a little louder, but not much. It has more of a raspy, works-like sound than stock. It makes the power a little livlier and snappier than the stock silencer, particularly in the mid range. It also offers a decent weight savings over the stock stovepipe.