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My throttle body was spotless after approx one year on the K&N, cleaned it and re-oiled so hopefully next year will be the same. Filter was dirty so doing exactly what it should. I would also advise use the proper KN Re-Charge kit.

i done mine 2 weeks ago throttle body was also spotless and the re-charge kit is very good
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silver 2007. full miltek system with sports cat. mountune cais. dreamscience 190map.cossie cams. weitec coilovers 35mm at front 40mm at back. 12.5mm spacers.300mm brake upgrade.magnecor leads. aero wipers.