I have an FMS extender for an 87-93 5.0 available for sale. The extender allows you to adjust the air/fuel ratio and raise your factory limiter. These sold for around $500 new, but they are now discontinued from Ford and getting more and more difficult to find. I will sell for $350 shipped..Paypal preferred. Please email me at EBerman@superstallions.com with any questions
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