Does anyone know how good Big Gun durability is. I have heard bad things but maybe thats a rumor. First question is, How is this old big gun slip-on? For durability and power. Can i get a high flow header for this? http://cgi.ebay.com/ebaymotors/Honda-XR650R-Performance-Exhaust_W0QQcmdZViewItemQQcategoryZ35596QQitemZ4620650506QQrdZ1QQsspagenameZWDVW What about the new big gun evo x series? for power and durability. I am looking at the full system. http://www.biggunexhaust.com/product_info.php?cPath=13_14_41&products_id=455 Only one question. On big guns sight it says just the slip on says jetting is required. On their full system is says no jetting is required. Is it a typo or what?? My next option is to get a brand new Pro Circuit T4 system. Only $536 off ebay. Noise is not a problem also.