All, I was given an exhaust for my WR400. I installed the exhaust and, no surprise, the bike is quite loud. Previously I was running the OE exhaust that was gutted (I bought it gutted) and a PMB silent insert. This resulted in an acceptable noise level to me. I installed the FMF exhaust because it had a S/A, which my OE exhaust didn't. My question is: I'd like to install a silent insert in this FMF exhaust, but I can't see a way to do it. From what I have researched it seems there were different models of "Powercore 4" and the universal one I have doesn't seem to accept a silent insert. It seems the S/A screen is welded onto the muffler core. Also, there is no hole in the end cap that would accept a set screw like it seems the Silent inserts required. Am I missing something? Is there a way to install an insert in this model exhaust? Any recommendations would be great. I love the sound of the exhaust, but i'm just trying to be a good neighbor.