QA1 High Travel Coil Over Spring 2 1 2" I.D. x 10" Tall 550 lb. 32020P The ECU requires to know FIV20002 41551 OR The ECU requires to know when cylinder number one is firing (or preparing to fire) so it knows the sequence of the injectors coming next Under Chassis Design Engine Swap Headers Swap Headers allows for greatly improved fatigue life street performance
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