I agree run the stock pipe till it is no longer fixable...FMF does not appear to offer any gains on our bikes.
This is the problem with GG, i am really finding it difficult to improve it .... WHY OH WHY DID THEY HAVE TO THINK SO DAMN HARD WHEN THEY DESIGNED IT!!!
Thanks GMP for the info. Nate I don't have a 09 WR 300. I almost got one but the Gas Gas 300 ended up comming home to me. I sold my 09 TXC 510 Husky and the only other Husky I have now is an 08 CR125. The comparison to that is, The 125 feels/is lighter when taking it off the stand but once in motion they feel almost the same.... until you add throttle LOL.