Looking at a couple of bullets, is the notched transom on the 89 much better than the flat transom on the 88? I know that there would be a difference in speed, but anything else?

There might be a difference in porpousing.

Check with Member Carter38 here on the board. I know he has had several bulletts, and can probably give you some hands on advice....

Carter38 has just sold the 2 Bullets he's had.

I have an 88 without the notch and it does not porpoise. I am told it is slower than with the notch.