http://www.autronic.com/page_files/sm2_kit.htm
http://www.aempower.com/product_ems.asp
I don't know which one to choose. Ohlsens Development who are doing the work for me is more familiar with the AEM, and they recommend it because of that. However I like the SM2 because it has 3 boost profiles that can be switched to and from on the fly. On the AEM I would be able to do this, but through use of an external solenoid, the ECU wouldn't have another complete map to run on though, which mightn't be the best option if I was running in the max boost mode when I'm say racing on a circuit.