Not sure why the autozone piece only lasted you 6k miles,but ive never had problems with the above chain.Hell ive seen people run em on slants pushing 20+lbs of boost,and some n/a slants making over 250 crank hp.I also had a buddy that ran a 20 buck autozone chain for over 60,000 miles.My point being you dont NEED to spend big bucks on a chain.