'79 dual exhaust

Hello fellow C3VR people!

My question concerns exhaust systems. I've read a LOT of posts here, but am still somewhat confused.

I am installing a BowTie Overdrives 2004r in my '79. Since I need to take the exhaust system almost completely apart, I've convinced my wife (a key component!) that now is a good time to update the system. I want to go with Dynomax (sp?) headers, ceramic coated by JetHot Coatings, and dual 2½" exhaust pipes all the way back. The car currently has the anemic L48, but hopefully that will be replaced with a 383 in the next 12-18 months.

I've seen people mention Corvette Central's and MidAmerica's exhaust systems as being very well made. However, will they mate up to a header collector? Or would I have to cut a certain amount off and weld the collector to the remaining "stub"? OR, should I get some flexible hose or tubing, create a template, and have a muffler shop weld a system for me? My car is now old enough that I am no longer subject to emissions testing (25 year old car, Colorado) so I won't be using a cat. converter.

For those of you w/ factory dual exhaust, do the pipes converge and run underneath the rear differential mount?
It's not real clear to me what the best routing might be.

I realize this is a "tired" topic for some, but I appreciate any additional information! Thanks!

Do you have the twin holes for dual exhaust to run through the transmission mount,if not you'll have to run a y-pipe through the trans mount then y it back out to duals after that or go with side pipes.

Yes, my original crossmember (bolt in) has the two exhaust pipe holes in it. I also purchased a tubular steel crossmember from BTO that allows for dual pipes.

Azul:
I put the dynomax ceramic coated headers on my tired 'ol L48 last year. Love them! No matter what, I think you're going to find that there's a certain amount of "fudging" to do with any exhaust system. Nothing fits perfectly. Not much help, but I know you'll be happy with the headers!

Any true dual kit you buy is made to fit up to factory manifolds. When you install headers, there will be some cutting and welding to do, but it will be well worth it. I did the same for my '80.