I've seen a 2.1 abf turbo in a corrado with 500bhp. That was PVW and it had mega bucks spent on it and I think the owner built it over many years.
And my mate works at pro alloy (1 mile from my house) and they've built a 500bhp 1.8t lotus elise. For not a big sum. And I've seen that thing go many times! It's scary fast!
What I'm saying is its bang for buck! I think the 1.8t will give more power than a abf with same money spent.
You want big power then you need to forge the internals on both, so talk of what's stronger doesn't really matter.
