Welcome,
That's a whole lot of views on your post and not a lot of answers !
I'd 100% be fitting an uncracked standard intake. There will be plenty on ebay. Fix what you know is broken right? If keeping the intake standard, fit a OEM Edition 30 filter. It's a little thinner than the standard GTI one. I've toyed with the idea of a CAI system, but I really do not want additional noise or to lose the engine cover. Standard airboxes are good for quite high BHP figures anyway.
I'd not bother with R8 coils, unless you want the aesthetic of the red when you open the bonnet. I went for standard OEM coils. What will benefit you in that area is a set of iridium spark plugs. I forget the make, NGK maybe? I could look that up if you need.
Stage One remaps really wake these things up. Just beware that a worn clutch will manifest itself fairly quickly post remap. I faced this problem and opted to fit the TTRS clutch unit with new flywheel. Expensive, but totally OEM feeling and good for a fair bit of power. I'd not worry about mileage covered on the engine already though. If it's been maintained it'll likely be fine.
In regard to maintenance, which I'm just throwing in here, has the engine had the sump dropped and oil pickup replaced? Has the cam follower been checked / replaced? Please consider these prior to anything else, as they're a potential killer of these engines.
Good luck !
Thanks for the reply! I appreciate the insight and you passing on your knowledge
I’ll stick to the standard one, as I too like the look with the engine cover.
As for the maintenance. I’ve actually replaced the cam follower, PCV valve and pipes, the charcoal canister and EVAP purge valve, and I have had the sump off and replaced the pick up and the oil pressure switch.
I know it’s overkill but reading all the “common” issues with the car I wanted to get them all done and out the way so I didn’t have to worry.
As for tuning. With you explaining the engines are strong, I think I’ll go for a stage 1. I don’t push it often but like you say, when I want to, that little bit extra power will be nice!
Thanks for getting back to me!
Happy motoring