Believe it or not. The Helix and the Carbide have the exact same engine but the Helix is usually faster because it weighs less and has smaller rear tires. From our experiement here, the best most you can do are a UNI filter and soon to be tested FMF exhaust plus the jetting. As soon as I can get my hands on an FMF to test and confirm it's improvements, I'll let you know. The UNI has already been confirmed.
Also, what kind of riding do you do? Trail? Flat track?
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