COMPETITION SERIES , 138MM ALTERNATOR WITH MORE ADVANCED COOLING THAN THE 128MM STYLE PROVIDING PEAK OUTPUT AT THE LOWER 600RPM.   Every AutoTech Engineering unit is assembled 100% in Riverside, California. With over 100 years of combined, “on hands” experience and the fact that we have been in business for over 28 years has allowed us to source and supply the highest quality component parts to ensure your unit exceeds expectations. All are plug and play unless over wise stated. Some modifications such as adding spacers or plug harness are included at no extra cost. Voltage is set to OEM minimum specifications on each unit ordered unless otherwise requested. If you need higher voltage, contact us before ordering online. OUTPUT RATINGS: 390AMP AT 1800RPM / 215-220AMP AT 700RPM, 14.8V.  THIS UNIT FITS IN STOCK LOCATION WITH NO MODIFICATIONS AND YOU CAN USE YOUR STOCK BELT.  SPACERS ARE PROVIDED FOR THE MANUAL TENSIONER .  YOUR IDLE RPM MUST BE 700RPM.