Hi, I have a new 2009 KLX 450r just run in. I am a bit (really) unimpressed with the performance and it sounds horrible and feels very sluggish (my DRZ went heaps better). I have removed the throttle screw on the carb and pea shooter. I am looking to purchase and exhaust that adds performance and sounds good. It appears procircut t4 is the most popular exhaust system however i also hear that the KX 450 system fits on well. Sound restriction is not an issue as i am a long way from others. What is the best value for money pipe either just slip on or full system you can offer. Anyone know anyone selling a KX450 system? I will keep you updated as to any improvements rigt now thinking i should have brought the WR 450. Dan Burton Australia.