To the OP, you can add 52 hp to the 125i as well with just software than enables the DISA valves that are already there but not turned on. Check out the thread in the 128i engine section about that.
Nice to see someone finally get behind the wheel of the N52 and get it. It's a simply brilliant engine.
Originally Posted by Dackelone
I just recently drove a 125i and really enjoyed it too. Just wait to you put a BMW Performance Exhaust on he car. It is by far the coolest sounding exhaust I have heard on a NA. Lots of pops and gurgling - really nice.
Yup. With my SuperSpint headers any time I let off the gas and she goes into overrun there are just a series of pops and gurgles.