I received my Sparks full exhaust a few days ago. It looks awesome. The fit and finish is great. I got to ride with it on saturday. Big increase in power, especially in the bottom end and midrange. It lets the engine rev quite a bit faster. The pipe sounds way cool but is very loud. They reccomend using the stock jetting. I have the needle jet raised one notch because I was running without the airbox lid snorkle before I got the pipe. I put the snorkle back on when I installed the pipe. I have main jets ordered to tune it with the airbox lid removed. I hope to gain more top end.