Hi I'm new to the detailing and tuning scene. I've a stock 2011 s3 (8p). Was about to order a scorpion 3" downpipe with sports cat; well that was until I saw a message saying "Fitment Notes Stage 2 remap will be needed. Check Engine Light will probably show and limp mode may activate" Can anyone shed some light on this before I order it? Do I really need stage 2 first and Is it worth fitting this to my s3? Much appreciated thanks guys.