Hey gents, have a serious question I would like answered, any advice is much appreciated. I recently bought a 2009 XR6T FG, and was wondering the first go to modifications that make the most power. Currently willing the spend 5K, was wondering if anyone had previous experiences. I'm looking solely for straight line power, wondering what type of power improvements can be made with 5 grand.

It might cost you a little more than 5k, but put it on JTG liquid injected LPG and upgrade the petrol injectors to 42lb, remove the middle muffler and get it tuned to suit the above... more than 500HP at the wheels from that.