The 550-903 uses the terminator ecu or xmax ecu that will also control single wire DBW throttle and electronic transmission control.
The 550 608 appears to use a hp ecu.
Double check what ecu is included with the kit you choose.
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Chris
1969 Firebird: injected Pontiac 462ci, T56
Last edited by Tinker; 04-19-2022 at 08:36 PM.
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