jrodhotrod - Compared to the E6X it is no match. The e-manage is limited in what it can do, but at that, it can support most of the normal mods that people are using. With 10-12psi and the mods you will have I would suggest upgrading the injectors at that point.
AutoBox - I would recommend a wideband to any person that is going to modify air/fuel ratios on any vehicle. The 3rd bung will be needed on a custom exhaust. The stock downpipe has a wideband bung in it already.