I'm not trying trying to steer you one way or the other - just want to make sure you know that the pro & 3x are pretty much the same aside from case and coil drivers.
I called Mike at EFISource and he filled me in on what he offers. It is all self contained and plug and play but you also need to use a certain throttle body as well as a wideband setup. It is tuned with Tunerstudio and is pre-loaded with a dyno optimized 6.1 tune. After speaking to him I'm sold just need to get the engine and car ready. His setup is on a couple Drag Pack cars and his LS1 setup was used by BES in this year's EMC.
