Well, here goes:
About two years ago I had a motor built because, as we all know, 1600 is fun but more is ALWAYS better. Anyway I went with a 2180cc motor using 68cc Panchito 44 heads and 92mm thick wall cylinders. I kept the compression 8.2 : 1 (more on that in a minute). I’m running a CB Performance 2242 camshaft, external oil cooler, thin-line oil sump, full flow 31mm oil pump and an electric fuel pump. I started with the Magnaspark ignition, a pair of Webber 44s, and an EMPI sidewinder style exhaust (this all changed).
At this point the estimated HP was in the 135-150 range. I never ran it on a dyno but it felt like I had easily twice the HP of my original 1600.
Now: back to the 8.2:1 compression. The reason for that was my overwhelming desire (sickness?) to run a turbo charger. As it happens CB Performance has a “hideaway” turbo kit that comes with most all of the goodies including a T03/T04 Hybrid Turbo with a 0.63 A/R Exhaust Housing P-Trim Turbine Wheel, H-Trim Compressor Housing (0.70 A/R), and a 59mm Compressor Wheel.
SOLD!
The exhaust tip was just that; a tip. So I sourced a tri-mil muffler I found here (thank you @Jimmy V. !). The tri-mil had already been modified and was apart from the tubes: exactly what I was looking for! Some cutting, welding, fitting, ceramic coating, and adjusting got me on the road and all sorts of happy.
Turbo went on over the winter of 2020-21 and the performance was beyond anything I could have imagined. After a few months of driving and tuning I wore tired of monkeying around with the carburetors. So…EFI was the “logical” step.
Now I have a Megasquirt system that effectively replaced the Webbers. Also added was a crank fire ignition. Tuning is done via laptop using Tuner Studio. I drive with my wife in the seat next to me running the laptop. In under an hour we tuned this monster; a job that would have taken hours or days with jetting and timing changes. With the software we can adjust the AFR and timing literally on the fly.
More to follow.
....that set up isn't for everyone....me being one i absolutely admit!....my VW days are over.....i'll stick to the turn key SUBARU power....just because my tinkering days on cars and bikes are over..i still have some knowledge, but just choose not to...just a personal choice 
happy BOOST motoring!
....i try to always do the "at an angle" slink when entering and exiting nearly ALL driveways & speedbumps....i have accidentally hit some HARD....which is a SPHINCTER CONTRATING moment....if you have one of those moments at any real speed with those low hanging pipes....the OUCH FACTOR along with the $$$$ factor could be serious.....all you can do is be wary as best you can...safe & happy motoring 
