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Headers and Exhaust System Discussion related to Exhaust systems and headers.

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Old 03-12-2020, 08:37 PM   #1
Clutch Powers
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Default Single muffler on modified cars

Years ago, my college roommate had a í67 Camaro that his older brother had built with a mild 327 and headers, which went into a single muffler with dual inlets and outlets. The car had an amazing sound, which was a bit unique.
After college that car was long gone, but I wanted to build a replica. My Camaro had a similar smallblock with headers, etc.
I called the older brother to find out which muffler heíd used on the original Camaro he'd built. I was surprised to hear him say Ė a stock muffler! Sure enough, thatís what I used, and the car sounded great - not lame and quiet like I would have expected a stock muffler to sound.
So hereís my thought. Every modified Tri-Five in the world must surely have two mufflers; and a lot of the cars I listened to at the Nationals sounded similar to each other (loud and louder). Any reason I couldnít put a stock single muffler on my car (with dual inlets and outlets)? Sure, itís going to be weird and rob some horsepower, but Iím looking to mimic the sound of the old Camaroís I drove back in the 80ís.
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Old 03-12-2020, 08:55 PM   #2
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Quote:
Originally Posted by Clutch Powers View Post
Years ago, my college roommate had a ’67 Camaro that his older brother had built with a mild 327 and headers, which went into a single muffler with dual inlets and outlets. The car had an amazing sound, which was a bit unique.
After college that car was long gone, but I wanted to build a replica. My Camaro had a similar smallblock with headers, etc.
I called the older brother to find out which muffler he’d used on the original Camaro he'd built. I was surprised to hear him say – a stock muffler! Sure enough, that’s what I used, and the car sounded great - not lame and quiet like I would have expected a stock muffler to sound.
So here’s my thought. Every modified Tri-Five in the world must surely have two mufflers; and a lot of the cars I listened to at the Nationals sounded similar to each other (loud and louder). Any reason I couldn’t put a stock single muffler on my car (with dual inlets and outlets)? Sure, it’s going to be weird and rob some horsepower, but I’m looking to mimic the sound of the old Camaro’s I drove back in the 80’s.
Keep in mind that a lot of the reason for that "amazing sound" from the Camaro is due to the muffler location at the rear of the car VS the mid/front location of the 55-57 Chevy muffler location. The 67 Camaro had a tailpipe length of about 18-20 inches VS the 55-57 stock tailpipe length of about 8 feet and that will affect the sound at the tips.
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Old 03-12-2020, 09:04 PM   #3
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Keep in mind that a lot of the reason for that "amazing sound" from the Camaro is due to the muffler location at the rear of the car VS the mid/front location of the 55-57 Chevy muffler location. The 67 Camaro had a tailpipe length of about 18-20 inches VS the 55-57 stock tailpipe length of about 8 feet and that will affect the sound at the tips.
Good point Bruce; I'd wondered about the transverse mounting on the Camaro so close to the rear axle.
I'd always heard though, the further back the muffler is, the better.
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Old 03-12-2020, 09:17 PM   #4
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Quote:
I'd always heard though, the further back the muffler is, the better.
Better for what?

The thing about a single muffler, whether you like the sound or not, is it's going to have more restriction than two mufflers.
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Old 03-12-2020, 09:25 PM   #5
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Don't forget, the camshaft's exhaust duration also plays a major role in the exhaust note, and its loudness.
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Old 03-12-2020, 10:19 PM   #6
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Originally Posted by Clutch Powers View Post
Good point Bruce; I'd wondered about the transverse mounting on the Camaro so close to the rear axle.
I'd always heard though, the further back the muffler is, the better.
Those Camaro "crossflow" muffs always sounded good to me also.

And putting some mufflers like glasspaks WAY back there are far better off being far back there, for heat/burn up reasons.

I believe Bruce's comment to be correct. Another factor for good sound that I found by accident is the placement of the tail pipes, if the pipes are run all the way back and under the bumper. Placing them a little over 3' apart causes a certain harmonics that sounds SO very good to the ear from the drivers seat.

It will be good to hear you're results after you do it. I have an old Chevy truck (88) that I've been contemplating doing that on for some time, and with two cats. It's either that or trying two cats with a true dual exhaust. Dunno if Calif inspectors would let me get away with it though.
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Old 03-13-2020, 12:19 AM   #7
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I'm not sure where you would install a transverse muffler on a trifive... they are not designed for that as are the C1 Camaros...
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Old 03-13-2020, 09:59 AM   #8
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a single cherry bomb muffler on a 49 I had, sounded cool.
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Old 03-13-2020, 08:32 PM   #9
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Quote:
Originally Posted by nad427 View Post
Those Camaro "crossflow" muffs always sounded good to me also.

And putting some mufflers like glasspaks WAY back there are far better off being far back there, for heat/burn up reasons.

I believe Bruce's comment to be correct. Another factor for good sound that I found by accident is the placement of the tail pipes, if the pipes are run all the way back and under the bumper. Placing them a little over 3' apart causes a certain harmonics that sounds SO very good to the ear from the drivers seat.
For years, I only considered the tailpipes to run out back under the bumper. However, I decided to try something different this time:



I think I like the new look.

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I'm not sure where you would install a transverse muffler on a trifive... they are not designed for that as are the C1 Camaros...
I may be wrong on this, but I'm thinking that "transverse" refers to how the muffler is mounted; rather than to the muffler itself. So on a tri-five, the muffler would be on one side of the car in the normal muffler location. The only difference would be that it would have two inlets and two outlets. Maybe it could be mounted in the center of the car, but that seems even weirder.
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Old 03-13-2020, 09:43 PM   #10
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I've seen plenty of single mufflers with two in two out. A lot of them are race oriented or are a substitute for a crossover.

On a mild 327 as long as it's 2"in/out I don't see any real reason it wouldn't work just fine.

The other option you might consider is a Y pipe in front of the single muffler to merge them into one pipe, maybe a 2.5" or 3" into a single 3" style in/out muffler at the rear. Certainly odd in a muscle car, but from a performance stand point I'd be shocked if it were any worse than a standard 2" dual exhaust 9on a mild 327 anyhow).

FWIW...my 1991 GMC Syclone runs a single 3" exhaust and I guarantee it's faster than nearly every car on this board.
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