I was trying to pick one between the profec b, avc-r and the sbc. I have used the greddy unit before and didn't care much for it. Sport Compact Car mag likes the SBC and you guys do as well so I guess that is the one I will go with. I am going to use a manual ball/spring one for intial break in on my engine and keep boost down around 6psi. Thanks for your suggestions.