I was wondering what everyone thought the best all-around exhaust was for a 400 EX. I am planning on purchasing a full system soon, probably a White Bros. E-Series S-Bend. Could you please leave some feedback of various popular exhaust systems based on: the power gains (low through top end), price, and quality. Where is the best place (price-wise) to get the exhaust system that you recommend? I appreciate your help.