1965 Dodge Dart 270 2 dr sedan

Hey Ulf....long time no see.

Regarding your exhaust system I'll just throw this out there.
I'm sure you know that the early A's (and 67) Commando cars came with a 2 into 1 exhaust system that exited through a rectangular-shaped resonator through the rear lower valance. What about if you did a similar thing and ran dual 2-1/4" or 2-1/2" pipes from the exhaust headers into a 3" "Y" feeding a single good flowing 3" muffler. One single exhaust from there to a rectangular exhaust outlet similar in looks to the stock hi-po system.

It still keeps that original Mopar vibe but performs better. The early A's were not really set up for dual exhaust anyway and this might make it easier. If you still want to run an electric cutout, you would only need one.

My son has a similar system on his Dakota 5.9 R/T. At 4000+ pounds it runs 13.7's with only bolt-ons, all motor through the muffler.