We purchased a 2.5L from S&J a year ago and had a friend do the work to certify the warranty. It’s been running fantastically for the past year. As a reference, my 2.5L has 113,500 and is still running very strong. While neither of them will do 0-60 in under 10 seconds going downhill, I can easily tell the difference in power and performance of the new motor in my son's TJ.