Hey guys Just thought I'd share my experience with e-manage. The only significant limitations I've found so far is that you cannot use the ignition control harness on automatics, and the speed limit as previously mentioned.
We can supply and fit them with all the optional harnesses for $1200.
As far as tuning goes they are a superb unit, and work well when doing AFM upgrades, eg Nissans using the 300ZX afm instead of a stock one. The basic air flow adjsut map works ok, much better than an SAFC, but the true benefits can be found after tuning the injector pulsewidths and you start to tune the timing.
For the value for money I reckon they're one of the best interceptor style engine management systems around.
Doc.