Our SPX-i series high-output alternators are the ultimate upgrade when you need the absolute biggest and most sophisticated high output alternator on the planet. All of our SPX-i series alternators are designed for one purpose, brute force idle output. When you need the most extreme idle output with the most sophisticated integrated alternator-monitoring system to prevent thermal failures is where the SPX-i alternator delivers. Every DC Power product we sell is held to the strictest quality standards in the industry. We only use 100% brand new USA made components along with one of the most rigorous testing before each individual alternator leaves our shop. Each SPX-i series alternator comes standard with our custom hard-anodized billet aluminum pulley and 2-year replacement warranty. If you're looking for a significant overall increase in top end and idle output, the SPX-i series alternator is your solution.