Not sure there's a huge amount you can do to the fueling system. Can always do the standards things like high lift/different duration camshaft, change the throttle body, different exhuast manifold, performance filter. If I remember rightly, the manifold from early golfs had the dreaded spring clip attachment to the down pipe. I also seem to remember reading the kjet engine in the scirocco I've got has the same BHP rating, but slightly lower torque (153nm as opposed to 159 for my golf of the same age) The scirocco has the same clip system + so upgrading the manifold there might help. Not saying that the different torque couldn't come from the kjet system though, just speculating. KJET is a good system - the 16v uses a (modified) version of it.. It's nice and simple and was used on LOADS of cars - audi quattro etc.
