I'd recommend the pipercross pro r at £30, it's reusable and dry so no maf oil risks, in the independent jap tests it added 9bhp which was the same as cosworth which is also dry and costs about £30 but isn't reusable, k&n and green are both cleanable but cost slighlty more, they added 10/11 bhp in the test but why risk using these oil based filters for that little gain however small the risk maybe
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