I had the Code 3 (65mm) for 2 years. I never saw more than 17.9 psi, ever. Multiply all day long and that won't change. I see 19 psi with the 178. This is at 100' above sea level, more or less, and on a 90º day for both. I've never seen evidence of a slipping belt, ever. But I did take the opportunity to instal a PSK with the 178. Just the facts here, no speculation.

Les