Lean jetting leads to long warmup times, surging, and balky throttle response. Then add a less-restrictive exhaust system, and your marginally too-lean bike is now much less happy. Cobra's jet kits transform your bike's manners. By tailoring the jetting of your bike's carburetors for your local climate, your exhaust system, and your style of riding, it's possible to have a great-sounding, great-looking bike that also happens to perform great, too. Easy, bolt-on installation.