its hard to say really, i'd say it would be as quick as a 2.0 if not more, i had them on my std engine with a 1.6 exhaust and it made a hell of a difference, what you would be better doing is converting to a 2.0 then using the carbs, we did that to a gti a year or so ago and it was faster than a cammed up RS2000 that we had at the time