That's correct almost50, it's all in the ability to breath and heat reduction. Milltek got 30-35hp gains by opening up the top end of the exhaust and tuning on the RS4's so it wouldn't be unreasonable to expect similar gains for the S5. Not sure how much it'll give those with a blower, the ristriction I'm aiming to remove is build up of heat, any further breathing gains will be a bonus. It will make it louder. Anyone who's heard my car (Milltek DP's and non-res) will know it's LOUD, 4k rpm test at Castle Coombe recorded 110db which was right on the limit of being aloud on the track and beyond most track limits. I'll almost certainly be reverting to resonated to compensate for the increase but we'll see how things develop.
Here in the UK we require cats to pass our yearly inspection (MOT once the car is 3 years old) so we are aiming to remove the primary cats but install race cats further down the system which should suit your requirement bhk1004!
All info will be shared as it we get it. I'm back at MRC on Wednesday so will see if I can get advice and pics of how they'll instruct Milltek to go about it.
I'm not expecting this to happen to quickly, from what I'm lead to believe Milltek have been doing up their workshop so well behind on development. Realistically I'm going to have to pull a few strings to get things moving on a reasonable timescale.