Save your money, get a BIGGER BIKE, ie CRF 250-X and add a www.koubalink.com lowering link,. YOu adding a few read 2 hp for 400/500 dollars. This bike is not worth pumping more dollars into it dollar to hp ratio. START with a good foundation, teh 150/230 are entry level bike and are fun,. YOu never ride full throttel anyways, you can make a gear change larger in front one tooth equal 3 in the rear adn will give you more miles per hour top end speed, but going to 1 12 tooth will give you quicker/faster and more leveraged hp to get climbing done or tight trials.