I just installed my perfex kit and hl's lift springs and will have my bi/tri claws later this week, and wondering how well me 450 will push these stock. I looking into getting a HMF pipe, but have a problem. I ride at couple of natinal forests and need a spark arrested muffler with a baffle. I also do not want a super loud muffler like the utility series, but i know the quiet core can be purchased. When at home and riding local places i will take the quiet core out. I think the rangers at the forest use a broomstick to check if there is a baffle in the muffler, but i think with teh quiet core and screen type spark arrestor they would not be able to, correct? I also plan on getting triangle atv snorkit kit, a uni filter, and havent decided on with what jets to get factory or dynojet, i have been told to get a factory 135 or 138 main with snorkel, muffler, and filter. I need to know if i can run this at national forests with no problems? I ride at Uwharrie if that helps anyone aroud me who may have a similar setup.