I've had my 505SX for a few years now with the FMF slip on--the black one that came with the deal. Now I'm thinking about getting the FMF power bomb header to get a little more performance. Does anyone know if it is actually an improvement over the stock header? I've read through the various threads, e.g., pipe shootout, etc., but I'm not seeing a definitive answer on this question. I was thinking about going with a full DASA system but unfortunately they don't make the header anymore. Plus I don't want a system that is too loud, which the DASA may be. Thanks for your input.