You can use your trans on any 88+ D-series, except those new backwards-spinning D17's... well, you can probably use it on those too, except you'd have 5 reverse speeds and one really short forward gear. :chuckles:

The D15B is rated higher, but if you put it on a dyno I doubt it would produce more power then a Z6 or Y8. They have a similar redline.

When you turbo, you want the highest displacement you can get. That's not something the D15B has to offer.

What's wrong with the D16A6 already in it?