There's a few parts on a stock Harley-Davidson that beg to be customized - or how we see it - tossed in the trash and replaced with something X like; perhaps a shiny new Xtreme Machine custom air cleaner. Why the would you want a standard piece of metal bolted to the heart of the motorcycle when you can place a premium piece of billet with an attitude that matches yours. Designed to match our wheel designs, these air cleaners are like a sister to our wheels, but look great if you don't have it's matching sibling yet. Oh, and did we mention an increase horsepower?