I just install the powerbomb4 by FMF and the GYTR exhaust by FMF too, and i feel the bike is running at a higher temperature than with the stock pipe system, i would like to know if it´s normal with the new powerbomb or if i should keep working on the jetting, i think the jetting its ok now but the overheating makes me think i´m doing something wrong or if its normal. maybe its important to mention that i usually ride in tight trails and that i did all mods for the WR450f (grey wire, AIS and snorkel removal, YZ throttle stop etc...). We ride long enduro trips and we have big changes in altitude during the same trip. One of my enduro friends told me that i should go back to the stock because this new system just give me some extra torque in top end and in tracks where you keep riding at the same altitude and you don´t need to work the jetting every time. He should be wrong as someone told me in one of the forums here in thumpertalk.