You may just be right. I'd still like to know the difference in slack between a new chain and a used one. I want to measure mine to see if it's way out of the "correct" size.It's a different engine. If you want to know the benefits of that gizmo, talk to an engine builder who specializes in race engines. IMHO, it's overkill for a street engine. Yours is going to be stock, so it's even less necessary.