Five cylinder NB

I'm not an expert on the subject but the head itself is most likely one of only several components that goven HP. Slapping one of two Lambo heads on an inline block of the same size doesn't necessarily mean that the engine itself is 1/2 of the Lambo's HP (so 250) because of other factors that could be going on.

A few googles turned up that the Lambo and Jetta are about the same bore and stroke. However look at the compression ratio...Lambo 11:1, Jetta 9.5:1. That's gotta have something to do with it (and the Jetta not needing premium fuel).

The Jetta also could have conservative ECU settings as well. It doesn't require premium fuel so the timing settings are tuned for that and not for power. It's been rumored that this engine is not currently tuned to it's full potential and there's quite a bit of room to grow there.

So what I'm getting at is that all things equal the Jetta probably would be

Also note that VW has never been in a HP race with the competition. All out HP is not what VW is about with their passenger cars. VW has usually tuned its cars (we're talking the non-high-performance ones like Jettas and Golfs and not cars like the R32) for an overall balance suited to daily driving and not balls-to-the-wall racing. HP isn't everything when it comes to everyday driving.