I've got a '06 WR450F with all the jetting and de-restricting mods done including a ProMotoBillet exhaust insert in the stock pipe. I'm looking for a little more exhaust tone and performance. Both DG and the Lexx Mxe slip on can be had for about $180, I also considered a FMF slip on but it's a little more @ $240. Any advice and experience welcomed. Thanks.