The FMF Shorty pipe is a good race pipe. If you're looking for a cheap pipe and dont mind it being loud this would be a good pipe for you. Also i would suggest getting it tuned as far as jetting goes with the pipe. You can go without it and be fine but you won't be running nearly any back pressure. Thats the reason why i didnt give it 5 stars. If you jet your bike right you shouldn't have a problem with the "lag" i got up top in the rev range. Again, this is a loud pipe. It isn't insane if you keep fresh packing foam in it but if your not up for replacing it, it will sound like you have a can as a slip on. Loud, Raspy, and obnoxious. With the packing foam it sounds great though!! Wouldnt recommend it for woods riding. Good for MX.