So, how do you determine your ratio?
On a chevy is was easy.... spin the back tire one rotation and count the number of driveshaft revolutions ... This Porsche is a tad bit different 
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82 Porsche 930 Euro, black, 31K miles.
Factory stock other than k27 turbo, B&B headers, GHL exhaust, Tial F40, 1 bar wastegate, MSD 6A ignition, 8" and 9" Fuch upgrade, H4 Xenon headlamps and a 930S steering wheel. 
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