The older style vf's can make decent power on a 2litre especially when using a vf34 with p20 housing. But on a 2.5 they would be pretty chokey up top.
Personally I don't see any reason to stick to a vf series on a 2.5 when a decent sized turbo can be had for less than 2000 dollars.
Some of the 2 litre guys are running vf36 twin scrolls or vf34 hybrids getting close to 200kw atw.
