I own a 400ex and was wanting to get some more power. What I was wondering was, as far as exhaust goes, do I need to replace the header pipe or will for instance a fmf exhaust pipe do the trick. I have heard both ways. Some say the power is in the pipe some say the muffler and some say both. Also do you have any suggestions which is best for the buck, seeing how I don't have a whole lot of money to spend. Thank for any help, Mike

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Edited by Mike trx400ex