Nah, I know you know Jim...LOL!
I am running the stock 55pph, stock chip. I do have a supersucker throttle body spacer, and my fuel pressure is at 13 psi.
Exhaust is all new, single cat, 3" walker...

I am fully aware of the Smog laws in CA, I have done many conversions that have been state certified. This is a switch to TBI from TPI, I am preparing for the Certification. The donor truck was a 91...

Ahhh, ok. I thought I may have found my golden answer to why some gm trucks here in Cali have air pumps, and some dont from the factory.
Thanks!

Anyone know what the differences are between these 2 ecms? is one better than the other?
Trying to figure out what ecm will get me passed the smog natzies in California without a air pump.