I wonder if the difference between the two methods creates a noticeable difference? I wouldn’t think...
My thoughts exactly, Wallace. I've had a TimeValve for nearly 20 years, and I expect it to last the life of the car. Oh, I suppose when the car is running at 4000 RPM on the highway, and if you were to take a temperature reading of any of the bends in the SS piping, maybe it will read higher, but you know what? Who cares? It doesn't matter. Really.
I've never heard any mechanic say, "Oh, I discovered your problem. You don't have mandrel bent exhaust pipes..."
The REAL question would be, for purists, is if the OEM system is mandrel bent, and if its still made the same way today as it was 50 years ago...