Name is Kevin, 29 yrs old, been riding dirt bikes since I was a kid. Moved out to CA in '99 when I joined the military. Bought a Ford F250 w/ a V10 under the hood, and the gas price out here were just killing me! So, I convinced the wife that it was a good idea to trade in the dirt bike for a street bike. Bought an '06 Warrior in May, and found this site searching for a new exhaust to replace that rediculously huge "hot water heater" hanging off the right side. Just finished installing new exhaust and PCIII. Boy does this bike sound better! Sounds like a real bike now instead of a Jetson's mobile. Not looking to really dig in to the motor yet... yet! I see alot of suggestions to block the AIS, and add a BAK. Anyone wanna gimme a little help on just exactly what the AIS does, and what the benefits of blocking are? Another question... What the heck is the little black box on the lower left forward frame rail for? Is it necessary, cause it looks like ****?! One last thing, all you guy's bike are incredible!!!