An xr6 ecu will plug straight in. It will give you slightly better air fuel ratios, however without a full exhaust or a bigger cam any performance difference will probably not be seen.
An xr6 ran a slightly higher lifting cam as well as a higher flowing head and larger headers.
Hope this helps
88' EA 5spd Fairmont Ghia
93' ED 5spd 4.0L NA Fairmont
JMM Street fighter kit, race series headers, BBM, EL xr6 ECU, unichip, 3.45 LSD
1/4 mile time: firstname.lastname@example.org
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