65 Barracuda daily driver

Not loving installing the TTi exhaust. Everything needs to be modified and I'm not even half way done. Still gotta find different pulley. Still need to modify the transmission dipstick. Still gotta shorten the 90 degree oil filter bolt (to clear the TTi exhaust per their instructions. Might not need to shim the engine though. Also noticed that the driver side exhaust manifold wasn't sitting flush. Saw that while lying under the car. So I ground down the boss on the block with the dremel and got that fixed for the third time. Tailpipes and mufflers are in. I test fitted the down pipes and everything is pretty tight. The instructions also say that you may have to cut 2" off the H-pipe - it's more like 6 inches and I'm a little hesitant to cut these $1,000 pipes... I don't quite understand how you're supposed to put everything together from the back to the front. There is no room to slide the down pipes onto the H-pipe. So once the H-pipe is cut, I have to unbolt the mufflers and tailpipes again?! I'm realizing this is half a rant and the other half is thinking out loud about next steps. And next the step is to cut the pipes... Actually makes sense to cut off 5 inches, because the Dart wheelbase is 5 inches longer.