I'm sorry I can't help you with regards to fd2 fitment but I have one of these exhausts on my s2k and it is damn loud!! Sounds mental but if drone isn't your thing is avoid it. It doesn't bother me but my passengers tell me their ears ring after they get out of my car like they have been in a really loud night club.
The exhaust itself is superb quality and tig welded. I'd say of ot fits go for it. I could try get db reading of mine if it helps? Got to be similar.
If you could try to get a dB reading that would be grand. It'll be a bit different being an F20 and twin exit but like you say it should be in the same ball park.
It's shame you've mentioned about the drone. I went through that with the Spoon cat back/N1 I had on my EP3. I had the bung for it, but hardly ever used it. It got a bit tiresome after a while!
I would be wary John. Firstly, there might be some fettling required to get it to fit - eg hangars etc. Secondly, you could end up with something that's still way too loud for use as a daily driver. Thirdly, bear in mind that should you add other mods at a later date, a 76mm will get you power gains over a 70mm system (see PDF for a comparison on my FD2).
The hangars bit doesn't really bother me unless it turns into a rattling issue, as above my Spoon system used to knock something chronic in the rain as water kettled between the b-pipe and the underbody!
Drone does bother me to be honest, but I've little chance of knowing what it's like before I fit it unless someone else has taken the plunge on one first.
I know what you are saying about the 76mm system. That's why I first started looking at them but the Skunk2 76mm is way too loud. There's not a chance of that being track friendly even with the bung in.
Where I'm at now with it is I'm not even sure I'm going to go for an aftermarket header. The FA and FG guys in the States are fitting FD2 headers with cats to keep themselves legal in places like California. They aren't seeing massively different figures than those swapping out for full headers. The FD2 header is supposed to be good as it is. It's already a 4-2-1 and I've got the Jonster decat pipe too. It leaves it open for easily swapping the cat back on too.
I don't know if I've got the heart for for cam swaps again, multiple remaps and chasing numbers.
The major thing that bothers me is being 98dB and under. I have my doubts about the Skunk2 for that to be honest.
Is yours a TDi system Andy? The cost is probably comparable to the Skunk2 isn't it?