LS ECU options

[another69]

HP Tuners is an established well supported and widespread platform.
Here is the sticky general HowTo for Gen4 Ls if you go that route:
http://www.hptuners.com/forum/showth...al-Information

See the first item "Engine Modes" describes the MAF/MAP situation for these engines.

Thanks for shedding light on the factory ECU. You are steering me towards just going with the Holley, but the detailed response is appreciated!