Hi all pleasure to be part of the site. A few months ago I converted from old fords to an 03 plate S3. Its a lovely car and I'm enjoying owning it, however the itch for modifying it soon came so I started with an after market recirculating dump valve which I fitted a couple of weeks ago, the noise is great, however it seems I've lost a little bit of power :S and also it might be totally unrelated but the engine management light has now come on :S Im wondering if anyone has had the same problem? Any help is greatly appreciated! Regards. Fabian.