If yor chasing more bottom end response, a good way to improve torque & performance is to fit a volvo 240 fuel distributor head, airflow sensor flap & an Audi throttle body (match ported to the intake)
These mod's will make a world of difference to your Golf. The bottom end response is awesome. Doesn't make a half bad induction noise either. Along the line's of a weber!
The good thing is that it's all bolt on & you can't tell any difference's by looking at it as it's all bosch component's. You don't even have to modify the airbox.
The problem with the standard proportionng valve is you can't get enough out of them in a mk1. There designed for a totally different car, weight etc.
I couldn't get bugger all out of the standard mk1 gti either.
Also, the universal ones mean you'll have to plumb both of the rear brake lines into one line for the valve to control it.
Just out of interest, you can still get the valve's from VW at a cost.
Bit over the top at $155.00 each!
With any second hand's ones you should open them up, clean them & free up the spring's, cups etc. They can jam when sitting for long periods of time.
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