I replaced mine recently for only the second time in 140,000 miles (yeah I know, I let non-essential stuff slide sometimes.) It was VERY dirty, and I've noticed my interior gets less dusty now.
98 Contour V6 MTX, T-Red, 150k mi. Pic
SVT Dual Exhaust, KKM Intake, Donnely Mirror, Dension DMP3 Player w/80GB of MP3s, Wheelskin
95 F-150
91 Mustang GT
06 Honda Shadow Aero
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