Bill's 87 performance tune is kinda like 2 in 1...........it's definitely a performance tune, but yet it is an improvement in fuel economy as well (unless of course your flogging it steady).
I also have an 87 towing and a 91 performance!
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08 FX4 CREW
K&N 63 series Intake
Magnaflow SI/DO exhaust
Custom tunes
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