it tells you in your owners manual, step by step how to adjust your throttle, you just want to make sure it closes all the way when you let off the throttle, and opens all the way when you full throttle. If it doesnt, then adjust the cable until it does. Mine was fine from factory, but I heard some others where not...READ YOUR MANUAL....as for the Filter I recommend Sparks Racing Supercharger Kit. It works great on mine....go to www. sparksracing.com.....