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Hi,

I'm just checking if I de-cat my rs4 and put a spacer as they do on Evo's/Sti's - whether the CEL would still come on?

Spacers usually still end up triggering a code, plus in general, OBD2 readiness isn't generated, which can be a problem nowadays for OBD2 compliant vehicles. A good way to fix this is a proper software upgrade that takes the decat into account

I can vouch for complete straight through pipes...Minhea worked his magic on mine.

The noise with std backbox but stainless downpipes and no restriction is awesome.

Tartan Rob - you took out your cats and had no CEL? what did you do? Remap as what TradeRS suggested?