How do I improve the horsepower on my Kawasaki Vulcan 900 Classic Motorcycle?

I have a Kawasaki Vulcan 900 Classic, (it’s a cruiser) and I’ve heard of a few options to improve horsepower from other riders, from a gadget that optimizes your air/fuel mixture, changing your air filter system, swapping/hacking the computer chip, and changing the exhaust system.

So, my question is: What is the best / easiest way to improve the horsepower???


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