Whats the dual exhaust that you Malibu guys are running? G body 1978- 1983, was thinking about using an El Camino but there is a wheelbase difference, or just go with a custom system.
I used to do the Dynomax systems, but I've switched in recent years to Magnaflows. That's what we'll put on the 67 Malibu wagon we're building now. However, my exhaust guy for the last 25 years retired! Gotta ask around to see who others are happy with.