[Tripower455]

I just put a 3" system with Race Pros in my '66. Great product!

I did the same as you, and started from the rear. It was a mistake! I found that it was easier to get it right by doing it the other way, and putting the pipes from the X to the mufflers in last.

Don't cut any pipes until you are 100% sure that you need to (you probably don'!), and if you do need to shorten the pipes, only cut the header or muffler end. I ruined a couple of my pipes trying to rush the install when tired, and had to replace them. The spacing between the headers was perfect out of the box, and I ruined them by cutting the angle. Live and learn!

The X pipe should go right about where the U joint is. Try to keep it as high and forward as you can for ground clearance, but without hitting the crossmember.

The band clamps are fine. I was going to weld mine, but ended up just using the clamps. It makes it nice, because you are probably going to have to readjust it a few times to keep it from hitting the undercarriage parts here and there.

Good luck! I noticed a big difference in performance with my X system and good flowing mufflers......