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Hello All, Proud owner of a Black Sand Pearl in FLA. Mudguard install was cake!
I'm interested in the performance gains, if any, with the TRD filter...Is it permanent... or does it have to be regularly replaced??? Will it give NOTICEABLE gains? Great site and a great car.
 

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It is permanent; needs only to be cleaned approximately every 50,000 miles. As far as performance gains, all I can tell you is that I like the way the car drives with it.
 

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You can go with K&N filter (look up 03+ Corolla/Matrix drop in filter). As far as gain goes - probably nothing noticable, so wait for the CAI. I already had one of these filters laying around, so I put it in, and removed the charcoal filter in the top part of the airbox. *maybe* got a horse or two, maybe not...
 
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