You don't need neccesarily need a piggyback controller. The underground honda hacking community is running boost in the stock ECU nowdays. What you would need is an OBD1 P72 ecu (assuming you are using the stock GSR IM), and an ecu crossover harness.

After which you are using the honda ecu to handle fully programmable fuel/ignition curves, and retaining all diagnostic sensors and support code (idle/cold-start/AC etc).

Dynocomp doesn't offer this service. They look like they are a european tuning outfit, more power to them. But there are people with more experience with the honda platform.

-PHiZ