Glad to see this thread. I am thinking of ordering the TTI system for by '65 B-body. I have to decide:

1) 2.5" or 3"? Motor is a 493, dynoed at 586 HP, 620 ft/lbs
2) H pipe or X pipe? What are the pros and cons of each?

Also, does anyone know if the US Cartool "bolt to the crossmember" driveshaft loop will work with the TTI exhaust (either H or X tube)?