I actually noticed a bit of a differenc when i dropped in my helene performance filter. throttle response was a bit peppier, with noticible torque gains. my old filter was pretty dirty. But now, after having the filter in for a few months, i don't really notice the difference. I guess I have gotten used to it now. But nevertheless, it is worth the extra money.
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2003 Maldives Blue 2.5i -- 18" M6 wheels, 12mm rear spacer, ///MZ4 front bumper conversion, Eibach lowering springs, Koni shocks, Hotchkis F/R anti-roll bars, Helene Performance air filter.
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