Are you talking about the stock D15B2? The main difference is the intake, it's dual-point. The D15 has a less aggressive cam, and obviously .1 liter less displacement. You'll need to convert to MPFI to swap in the A6. I'm not going to detail that because there's plenty of information to be had with a search. That's really all you'll have to do, the rest of it is bolt-in. Also get the Si trans with the A6 if you can.WannaBe said:What is the difference in these two engines and if i was swapping out a 15B ('88DX) for a D16A6 would i have to make many if any mods?