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What do you mean by "hardware number"? Can you give an example?
1994 Mustang GT, 351w (377 stroker), TFS heads, hydraulic roller lifters, 1.7 roller rockers, explorer intake, T4M0, Quarterhorse, SLC-DIY wideband AFR meter
For example, hypothetically taking an ML2-303 and turning it into an ML2-304 hardware number. The issue is there are getting to be some pretty difficult to find ecu's. The biggest problem I've faced is once an ecu is flashed from one to the other, it can no longer be updated via IDS which can prove to be a problem. If you add the missing caps, lose a resistor or two, change the hardware number then boom, you have the correct ecu.
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