i am wondering which head pipe i should get for my 400ex. i already have several mods on my wheeler which my exhaust is a megamax. i was going to stick with fmf head pipes. im just not sure which one i should get. i ride in sand pits and trails mostly. i want more mid range power... out of the fmf high flo header, and the power bomb header, which one is better for these applications?? i dont care about the price difference. just wondering if anyone has used both or one of the two... let me know what you think.