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Discussion Starter #1
I have a x3z ECU set up with a SCT 4 bank chip w/ a custom tune on it. Say my ECU goes bad, do I need to find another x3z ECU ONLY? Or can I use an a9l or whatever v8 mustang ECU I can get my hands on? Does the chip care or override and do its thing anyway?
 

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You need to get the same ecu.
 

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You need to get the same ecu.
You sure? not sure on all factory MAF fox ECUs but for instance I thought the A3M and A9L were almost the same..
 

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Discussion Starter #4
My tuner, XXX Motorsports, told me A9L should work fine as long as I install my chip too.
 

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Double checked, you're correct as long as the chip is in there you can use any of the following

GUFB A9L A9M A3M A3M1 A3M2 D3D S0Z X3Z
GUF1 A9P A9T C3W C3W1
GUFA 8LD A9S
 
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