Seems like you have done some good research,
So the 1.8 or 2.0 16v are easily strong enough, guys on here are making your long term power goals
with stock blocks and stock heads, with 2 headgaskets stacked, so with your plans to do rods and pistons,
you will have no trouble with the engine, while you are there, stick ARP studs in everything you can. uprated s[prings and retainers are an excellent upgrade as are mild turbo cams.
The diffs are both comparable in every way, including price, start with at least an 02A trans with diff and a good
clutch. 020 can hold the power pending on the way you drive, i recommend starting 02A or 02J.
the turbo, i use a plain jane garrett t3/t4 .57 trim, .63 a/r. and it will meet your power goals, spool isnt bad
im seeing full spool (20 psi) at a little over 4000 rpm. its plenty to start with trust me! the expensive BBM
intake isnt really necesarry, but helpful up top. i use a factory intake from scirocco, it works well and cost
Now very important is Engine Management, I HIGHLY recommend something you can learn and tune yourself
when i lived in germany, i had to take the car to SLS for everything, its not ideal... I use SDS efi and love it
no laptop needed has its own interface works well datalogs etc. Many dont like it, and it doesnt have as many
options as many other systems, but it does what i need. youll probably need at least 630CC injectors to reach
Brakes, you should be sufficient with G60 brakes with uprated pads and rotors, factory disk rears should