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  1. thesmileyone

    thesmileyone Active Member Audi A3

    Has anyone ran an A3 TFSI or an S3 with a 200cell sport cat and the standard exhaust?

    Did it make it quicker? Did it sound different? And finally will this pass the MOT and what about CEL lights?

    Also do you need to upgrade the downpipe too or just the cat?

    I want a BCS Powervalve cat back but they won't do that individually unless I buy a 200cell too, I can't afford to buy everything at once.

  2. nluk100

    nluk100 Well-Known Member

    I ran a 100 cell downpipe mated to std cat back and it was fine - restricts top end power slightly but you get loads of extra torque and quicker spool up.

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