What efi system is best for a 4.5 pfi cadillac engine7

[dave w]

Using WBO2 with the '7747, usually requires using the AutoProm from Moates.net.

Using simulated NBO2 from a WBO2 has mixed reviews, sometimes the simulated NBO2 works fine.

The '7427 usually requires both the original NBO2 and WBO2 data streamed into a TunerPro RT data log to achieve the best tuning results.

dave w