Techrom and other people make those and they work well. Just one question though, the R32 Skyline ECU is programmable anyway (be it with only 8k flash), so has anyone bothered to check if the Pulsar one is too?
When the R33 was released Nissan locked the ECU, so a common mod back then was to replace that with the R32 GTR ECU (which alone picked up 10 - 15hp because there's not as tight emission control), but you could also reprogram the fuel and spark maps.
As always just because a tuner will try to sell you a £1000+ EMS doesn't mean you actually need it.