Hmmm, http://www.gearhead-efi.com/Fuel-Inj...B-Coil-on-Plug

My daily driver 1999 S10 is V8 powered (L31) with an '0411 coil-on-plug conversion.

Challenge - Is a custom '0411 operating system required for the 4 cylinder engine? It's my understanding the '0411 was never used with a 4 cylinder engine.