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trouble with reduced pulley it adds more air and not fuel and engines need to perfect mixture to keep running well to lean hurts them same as to much fuel will,, also really should run new 02 sensors and a cat on them old cars as this will reduce the risks of blowing them up or eating away at the piston crowns form pinking and knock,, and yes deffo need mapping to be at best and prolong engine life,,
 
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