Anyone running HP manifolds, 2 1/2 h-pipe system, Ultraflows, and 12" resonators in the tailpipes on a 440 b-body (1968)?

I added the tailpipe resonators to my Dynomax Super Turbos years ago because the drone would rattle my teeth. Made a big difference but the turbos are too quiet for my liking.

I did a lot of research on this forum regarding flow and it looks like the ultras are one of the best flowing mufflers. That should help my 440 (515hp) breathe a little better.

OT, what about some elec or vac cutouts? otherwise here is a BTT for ya. I've always heard good regarding Dynomax but dont remember if they were referring to super turbos or ultras.

All I can tell you is I run a full 3" exh system with the Dyno-Max Ultra-Flows and I like them. Its not super loud at idle as its alot louder when on the gas hard but its actually not as loud as alot of cars at idle. Ron

One thing is certain, you will notice a seat of the pants improvement in power when you take those restrictive Super Turbos off and put the Ultraflows on.

I recently saw a repeat of a "Power Block" TV show... Horsepower?...not sure, where they tested several mufflers on the same mule engine on a dyno. I think they might have used a LS-engine. Anyway, best to worst was a range of about 8-10hp max. improvement vs. stock muffler (on a street/strip build).

I pulled off my 2 1/2 ultra flows after a few years when I changed my exhaust to a 3" setup. When I took them off you could hear a lot of loose particles in them? They sounded like a Maraca when you shook the muffler...lol

I have them on my '63 Dodge.

I did turn downs in front of the rear axle.

No drone and they aren't loud at all.

Thanks for the replies! I pulled the trigger on the welded Ultra Flows! Might have to remove the rear resonators after I do an initial trial.