I don't know any specific answers, but the Rabbit GTI should make more gains than either Golf in ITB. It has the WORST exhaust manifold ever installed on a VW - swapping from the toilet bowl single outlet to the later dual outlet gives a 5hp bump on the A2. It has a lower stock compression and thus gains a bit more % wise with the .5 bump. I don't think the solid lifter head has any measureable differences from the later hydro. I would be surprised if it all added up to a 1.4 factor, but could see it being .05 more than the A2.
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