I have been so tempted to snap up that TT manifold for the last 6 months haha. There's another one up as well for a little cheaper but the wastegate pipe literally vents through the front quarter LOL. Don't think I'd have the police on my side if I drove around venting straight into pedestrians.
Yeah in terms of height, I know your feels. I got banked at work today and had to mosh to get it moving again. Awesome when it's in 5pm traffic. There is always more room to go lower though haha.
I've done S13 in the rear, pretty damn easy considering it was just swapping the top hats, in the front end, I have a friend who has played around with S13 front end into a ZX, and turns out it limits camber to ONLY positive camber, so will need a LOT of modification to actually get them in there. Personally I think the easiest way is sectioning the strut and welding in coilover sleeves.