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Mine is running fine with the gray CPS. I haven't noticed a decrease in fuel economy, but it did fail the #3 and #8 contribution tests (dealership tried to sell me new injectors because of this).
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Dennis
'99.5 F250 4x4 SC 6 speed 3.73 LS, Magnaflow 4" exhaust, South Bend con-o clutch.
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