You could get a K03 turbo from any 1.8T VW motor. Full spool is before 4000 and is good for around 21 psi... (I had it on my GTi and with stock 10psi you can feel it kick) Best part probably is the low end spool, 5th gear at 35mph you can hear it start to spool and builds steady boost before 3000... Just a thought.

Another thought... You could buy the k04 upgrade turbo and use it. Good for even more boost and has better boost response...