The easiest way to get more power is to modify the stock exhaust by cutting the inner pipe where it exits the exhaust and bending the pipe over as far as you can, this will allow mor eair flow. You then need to set up the jets with a 45/175 . Finally you drill out the plug for the idle mixture screw and open it up about 2 1/2 turns. This will cost less than $10.00 and give you a lot more low end and mid range power -= you will feel the difference.