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WHATS BEST FILTER KIT TO BUY ?JUST BOUGHT ONE WHATS THE BEST FILTER TO BUY OR FILTER KIT TO BUY
Filter kit as in "air filter" or as in "caik" ?
Air filter, some have fitted a I believe "sti panel filter" upgrade and have gained some power, similar is a "green cotton" with same-ish gains Or go full on with the "cold air indution kit" but a remap would be essential in doing this ! Or just leave well alone, it seems your well happy with it in standard form 2007 BMW M5
2004 Petter Solberg STi
If you search about you'll find the sti one but make sure you look at a few places for them & compare prices, usually between
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