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  1. Straight pipe instead of catalist

    Tuning & Upgrades
    Hi guys, Ok, so what kind of gains should I expect if on my CF2 156 Selespeed I would remove the cat and put a straight pipe in its place? Please bear in mind that on the CF2 the (only) lambda sensor is before the cat, so the ECU wouldn't notice the absence of the cat... ;) PS - I have a...
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