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photo of GT-500-270XP High Output Alternator for Ford Mustang with 5.4 DOHC

GT-500-270XP High Output Alternator for Ford Mustang with 5.4 DOHC

7 Reviews
$
Product Code: GT500-270-XP
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The GT-500-270XP High Output Alternator for Ford Mustang with 5.4 DOHC from Nations Starter & Alternator provides the massive charging capacity your supercharged Shelby requires for peak performance.
  • Massive 270-Amp Peak Output featuring an advanced 6-phase hairpin stator for extreme efficiency.
  • Exceptional Idle Amperage delivering a minimum of 170 to 190 amps continually at low engine speeds.
  • Severe-Duty Construction with 12 press-fit 50-amp diodes and oversized premium bearings for longevity.
This high-output alternator kit is the ultimate power foundation for GT500 owners running high-draw upgrades like dual fuel pumps, high-velocity intercooler fans, and aftermarket audio systems. Unlike a standard commercial alternator, the 270XP is specifically engineered for "brute force" idle delivery, ensuring your voltage remains stable at 14.8V even during heat-soaked conditions. As a premium upgraded alternator, it features a proprietary digital regulator that integrates seamlessly with your Mustang's PCM to maintain factory temperature compensation and lamp monitoring. By utilizing these high amp alternators, you eliminate the dimming lights and electrical "lag" common when pushing the 5.4L DOHC engine to its limits. Order today.
  • Billet Aluminum Pulley custom-machined and hard-anodized for superior wear resistance and belt grip.
  • Direct Bolt-In Fitment is designed to mount in the OEM location with no bracket modifications required.
  • Enhanced Thermal Protection, including 3-step internal monitoring to prevent performance degradation from engine heat.

Reviews

Average Customer Review:
( 7 )
Chas Bross from Seattle
September 15, 2025
2007 GT500 270XP Alternator
Installation was pretty straightforward. DO upgrade any EOM power and ground wires related to this upgrade as you're potentially running a lot more current through these wires. Instructions were not sent with my order so I asked for and received some. READ AND FOLLOW! Dont burn your car up! The wire length I purchased as an option was adequate if you mount your fuse near the battery box. If you
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wadha althuwaini from Springfield Gardens, NY United States
June 9, 2025
very good alternator
its a very good alternator i used in my carShelby gt500 1200hp & 1200tq
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Anonymous Person from Brighton, MI United States
June 14, 2024
GT-500-270XP High Output Alternator - 2007 MY
Although unfortunately the 270XP did not fit right on my 2007 GT500 (07-08's are unique) the service provided, always answering the phone , getting back & trying to help was outstanding. Nations has a very good reputation as well. They gladly refunded my money upon part return. Due to all of the positives with the experience I still give 5 stars.
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ROLF SJOLUND from HARNOSAND, Vasternorrland Sweden
May 28, 2022
Alternator
Rocketfast shipping and works greatOnly four stars due to wiring
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Anonymous Person from Southern California
March 24, 2021
Rquires modification
Not exactly a factory fit on 2007 GT500. Alternator connections will need to be extended as they are 8 inches to short as the connections on the GT500270XP are rotated clockwise from the factory alternator. The power post also runs into a stainless line that will require modification to prevent a direct short.Got it all installed and works great.
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