Hey folks. I'm pretty new to this site. A few of y'all helped me troubleshoot my '96 Silverado, but I have since bought a ECSB 4wd '99 Sierra. Something I've been wondering about lately is the swap capabilities of the NBS ECMs into our older trucks. The cylinder deactivation technology on these things intrigues me. Can I swap a new ECM onto the 5.3 in my old truck? I don't want to hot rod the truck that much, cause a 496 Olds stroker is being bolted together for my lowrider as I type. But up here in Canada, regular gas is selling for about four bucks a gallon in US terms. Also, will headers, a muffler, and a tune help my mpg at all? Or will it hurt it to gain hp? Thanks for reading this. Sorry if it's a dumb question, and sorry I'm asking about exhaust on the tuning board. Great website.

 

You would need need the engine, harness and pcm to get AFM.

 

No. The new ECM only runs the engine (including VVT and AFM if applicable). The ECM in your pickup runs the engine, transmission, ABS, and gauages as well as other things I have probably missed. The closest thing you could come to that I am aware of is an E67 ECU. You would also need a TCU. Not sure how well it would work.

Headers, a muffler, and a tune could help your mileage but it would depend on how you drove it after the mods honestly.