Ais pipe goes from air box to the head . Turns into steal pipe before it goes into the head at the front of the engine just above the exhaust ports . Block that and youre poping will be dramatacily reduced . Its only for emmision laws and getting youre cat up to temp quicker if running standard pipes

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Yamaha xt660x 2009 blue/gold mods= iridium plug, stage1+2, removed snorkel, blocked ais, akrapovric pipes, power commander pc3usb (pre made map), adjusted tps, dynojet 02 optimiser 30amp aux relay, smoked puig screen, oxford heated grips and brembo carbon ceramic pads, rfx 30mm bar raisers, puig long adjustable leavers, plus much more and a cheep �30 alarm which stopped it been stolen