My friend is going to be buying a '91 or '92 Coupe LX, 2.3L. He was wondering if there were any upgrades that were available for the 2.3L's? It's a non-turbo. I am aware of the obvious rearend gears, air filter, muffler upgrades. Is there anything I'm missing? It's a 5 speed car also.
Thanks!
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1984 Mustang LX