I am thinking of replacing the stock exhaust system and vortip insert with a new header and muffler. I have a 98 WR and I am more concerned with low to mid range power. I ride in the wood where I frequently have to loft the front end over trees and rocks or need to accelerate through whoops sections. Very little high speed stuff. I would like to get a system which isn't too loud but I realize this is a performance trade-off. Any suggestions?