I was under the impression that these literally run from a 12V source and pump at a really low rate to the the engine, ive spoken to a vag master tech who wasn't able to guarantee it but does doubt there is very very very little point in upgrading it, only benefit maybe prime faster slightly but can't see there being an increase in performance from it, it just delivers to the engine and doesnt run under massive pressure like a hpfp,
only way I can think of it is like maybe upgrading your washer pump
he couldn't guarantee it too me and im no expert but id want too see dyno results and data logs before I buy one....and soon
I need a new one