mafs either work or not im my experience.st24 and st200 mafs are the same(should be the 4 wire plug).ive got one on my mk1 and thats running st200 engine with various sensors from a norm v6 ie idle valve etc.
moosing pipes can be a right pain to sort.ive had to fit a longer hose with the throttle hang fix plug to stop the dreaded v6 throttle hang.