I'd like try to keep you away from the "copy" badges, cheap, but cheap for a reason, I have a pair of them and I can't see them going anywhere soon, though they are red with red script.
Given the choice, I'd rather a badge that only said "SUPERCHARGED" - ie without the square RED/CARBON bit, the back ground colour and script colour would need to chosen to compliment the car's body colour yes I know back to "copy" types!
Finally, I think that I have the "ideal" car colour for an MRC badge (deep sea blue pearl), just not got the commitment to raise the power/torque curve, or at least its shape as the MRC one dumps the low down power and loads it up further up the rev band. That is what Ford used to give us with their Sport/GT variants, very good for use on flat roads, pain in the bum when trying to make real progress on uphill sections.
I'm not trying to justify why I'm not, at the moment changing anything, but drivability must suffer a bit, though if you drive your car firmly or pressing on a lot then going the MRC route must be the correct way to go. If there was a "lighter/smarter" upgrade, maybe only up 400PS that just lifted the current curves up slightly and improved economy when cruising as a bonus - though these cars are not about economy I know, trouble is, Audi seem to have set the S4 B8 6MT up to be a bit strange - a lot of drivability due to factory spec tuning, but low gearing to allow it to accelerate well within class, which after a while makes it seem that in standard form it was a opportunity missed WRT the opposition! None of that stops it being a cracking car in my mind, though the USA motoring pundits seem to follow my thoughts I've just discovered while looking for something completely different.