EC does my tuning. I have ran code 3 pulleys for 4 yrs...it's is a 65. I only went to the 62 to push the limits and I will be monitoring everything while doing that. If you aren't data logging, then stay with a 65. You can't run lean with it. I like the 62's engineering. I wouldn't run aluminum pulleys, just me...not knocking anyone's product, just my personal preference. I will have the 65 1st gen Code 3 pulley for sale. A proven pulley, been around for 4 yrs but with limited mileage since mine are toys...not daily drivers...