I don't think the gains are as good on the 115PS engine. I believe the 130 has different injectors, or so I've been told.

I think Superchips only claim about 15bhp or so for the 115PS, so basically makes it about 130bhp.

Whereas the 130PS goes up to more like 160bhp or something. The old 2.0 TDDI claims an increase to 148bhp or something apparently though! Not bad for the "inferior" engine!