Interesting thread, I've had a fair bit of experience with supercharged engines although they were a bit more 'old school' than the Alfa TS engines. I've had/rebuilt/tweaked several Lancia Volumex engines and applied that supercharger technology to otherwise largely standard Fiat/Lancia twin-cams.
Some of that knowledge may be relevant to fitting a supercharger to a normally aspirated engine, even something considerably more next generation than the venerable twin cam.
The extra torque that a supercharger delivers from the moment you turn the key is impressive, always makes even a smaller engine feel like a relaxed large lump. Sure, there is a power sap as the engine is working slightly harder to keep the blower moving but it's relatively unimportant.
In one incarnation of my Beta coupé I fitted a Volumex supercharger system to an otherwise standard 2 litre twin-cam with no issues at all, although I toyed with the idea at the time of fitting different pistons they were way out of my budget so that idea was scrubbed. The bottom end of the engine was thoroughly overhauled and, as the oil pump and sump design on the old Lancias was a bit useless, a dry sump system from Accusump was fitted. An inter-cooler would have been nice but as the car ran standard Volumex induction (carb) I never got around to fitting one.
I guess what I'm saying is that you don't necessarily have to fit forged pistons or lower the compression, although it may be prudent depending on how much boost the blower is producing. I knew a couple of guys who simply fitted a spacer head gasket which effectively lowered the compression a smidgen to make them feel the engine was 'safe'. The fact the kit in the pics has an inter-cooler is good IMHO, more power and more reliability from a cooled charge. The oil cooler is a must to save the bottom end.
I don't know how relevant this next bit will be, but when it comes to cams (on the old Volumex engine) I changed out the inlet cam only. This was something Guy Croft had been doing for a while and at the time had up on his website - may still be there somewhere. With vernier timing pulleys I was running a standard exhaust cam and a slightly re-profiled Strada 130TC inlet cam. Power? Well somewhere in the region of 165bhp and I forget the torque figure - it was big. Not bad for a less than rev-happy old school twin-cam.
With a more modern engine I confess I'd have thought the same route on cams would be even more practical but possibly with an after-market ECU (an Emerald system for example) to allow for very accurate timing/fuelling etc. Does the Auodelta ECU allow for full mapping?
A quick word on fuel use - a supercharged engine when 'horsed' will
drink fuel like you would not believe, I think the lowest figure I saw on an animated run across the Highlands in the company of an Impreza was in the region of 14mpg but on the other hand a run down to Bath at the national speed limit (honest officer) to see family saw 44mpg on the motorway......
I miss that car and the (various) incarnations of Volumex engine I ran in it. So I hope to see more on this 2.0 TS conversion as time goes on, just my cup of tea
Just hope 'she who must be obeyed
' doesn't see I'm getting the spanner twitch again