But how to quantify different...1 horsepower? 5,10?. I'd say not enough to worry about, especially if you have a h or x pipe.

I think magnaflow had a truck with a six shooter exhaust set up in the back....you could do that but put on a set of pipes from a Lincoln town car so it is almost silent ...I hear some people like to cork their 500 hp 427's like that....8)

My mother, bless her heart, often said regarding such matters, "Everyone to thier own taste said the old woman as she kissed the cow!"  NS?

Yeah......Got an X.pipe

Sal old buddy old pal, a wink is as good as a nod to a blind horse so just go for it. I think it will sound pretty cool. I used to know a bunch of rednecks that ran one glass pac and one regular muffler on their dual exhaust and it always sounded good. Heck, anything is better than the open headers you had when we was tooling around in that thang!

Drone relief iz a possible side effect, as has been said.

Brother D, Did'ja Show the Kiwi's how it's done, Or just take in the local color??
BTW RU & Miss Shirley thinkin of going with us in July??

Tubo

Brother D, I keep expectin you to suddenly turn up in OKC with Johnathan Blue hair and that Kai fella to show them 405 boys what Mississippi Street Outlaws iz. I'd like to be there when Ya do. Even if all you got is an alcohol injected big block Chebby in an old Falcon skin.
6s6 would you be up fer that??

Tubo

Think of an exhaust system as being like a pipe organ. A pipe organ has pipes of varying tube diameters and lengths which each produce a different tone.

Two pipes of the same diameter and length will produce the same tone because they are the same tuning length. The problem is the exhaust runs through the pipes at different pulses. This creates dissonance between the two which is heard as an annoying drone.

Exhaust drone was a problem for the Ford engineers when they were designing the exhaust systems for the SN95 Mustangs. The solution was to stagger the mufflers, one ahead of the other by roughly 3".  This effectively changed the tuning of the 'pipe organ'  where both pipes were no longer producing the same tone.

Notice the stagger in length of the flanges right behind the crossover.