[jelco]

I have a carbureted crate sbc 350 engine LM1, stock exhaust manifolds and just bought Edelbrock e-street heads and comp cam CL 12-246-3 with new lifters, pushrods and stamped steel roller tip rocker arms that I haven’t installed yet.
Besides starting over and making it electric 🤮, how do I make this purr as quietly as possible?
Flowmaster, resonators, dynomax? Any advice on headers?

 

[540 Olds]

Collector to resonators, X or H pipe, then BIG mufflers...Dynomax 17236, then 2.5 tailpipes...

 

[jelco]

Which resonators would you recommend? Anything I could pull from a salvage yard?

 

[-SS454-]

stay away from any chambered mufflers.

 

[427L88]

jelco, all new pipe, no salvage yard stuff. Walker/Dyno used to make a "hemi" muffler with more baffling in it, which is quieter than the "turbo" series., now known as DynoMax. Frankly, if you use non-performance type mufflers it would be quiet.

 

[B52bombardier1]

I'm running a set of Magnaflow mufflers with an H pipe from a set of Hooker Blackheart headers. It could be a little louder for me but what I'm most happy about is no annoying droning sounds at any speed.

I think this is mostly because the shop welded in very good rubber isolation hangers to prevent droning. And did it at the proper locations to break up the resonance that causes droning.

Rick

Sent from my SM-G965U using Tapatalk

 

[hessz24]

Thrush turbo mufflers were quiet on my 350 with summit headers and an xpipe . H pipe should make it a little quieter too. My boss has a 69 Camaro with a built 350 with cheap headers, h pipe and the quietest flow master mufflers. All 2.5” and it’s super quiet!

 

[427L88]

THX hess, I mucked up manufacturers. Believe the turbos are baffled to be oem quiet.

 

[eagleguy]

Magnaflow system with X pipe. Mellow at idle, barks when hit and NO drone!

 

[nashville beth]

Dynomax Super Turbos. Use the long 2.5" since you have exhaust manifolds. They make a 3" internal but that would be a waste. Found this but I can't believe they would sell it this cheap :

Advance Auto Parts - Down for Maintenance

 

[jelco]

Dynomax Super Turbos. Use the long 2.5" since you have exhaust manifolds. They make a 3" internal but that would be a waste. Found this but I can't believe they would sell it this cheap :

Advance Auto Parts - Down for Maintenance

I saw that too but it’s out of stock and you can’t checkout. It must be a mistake.

 

[hessz24]

If you want quiet don’t do what I did now. Dougs headers, x pipe with pypes violator mufflers. Stupid loud! I might have to change it up.

 

[Monkey]

summit headers (half the price and fit really well for me) magna flow 2.5 everytime it the recommendation

 

[68Malibu]

Summit racing Turbo mufflers did well in horsepower dyno shoot out many years ago. They are fairly quiet. A friend has them on a 64 GTO and I think they sound great and are quieter than most performance mufflers.

Summit Racing SUM-631125 Summit Racing™ Turbo Mufflers | Summit Racing

Free Shipping - Summit Racing™ Turbo Mufflers with qualifying orders of $99. Shop Mufflers at Summit Racing.

www.summitracing.com

 

[weidhopper]

I have the 2.5" Pypes with xpipe and Race Pro mufflers out the back. Has a nice muscle car rumble at idle and not stupid loud under acceleration no drone either

 

[hydro462]

Dynomax Super Turbo #17749.. Its one of the best flowing mufflers out there. It also has a real nice smooth tone. Its not offensive but you can tell there's something good under the hood..

 

[billdini]

I used Hooker Turbo Comps with a H pipe on my 69 Camaro. Nice sound, could come to life under full throttle. H pipe is much quieter then a X pipe.

 

[RAIDER SS]

make this purr as quietly as possible

Magnaflow system with X pipe. Mellow at idle, barks when hit and NO drone!

I too have (& love) this Magnaflow sound system, but it does not fall under the OP's original request.

 

[amx364]

To be quiet with SBC try shorty headers and stock exhaust system or something very close to stock. Shorty headers help with starter clearance and might fit better then other choices. A BBC was never very quiet in stock form, however a slightly longer muffler would help. The limit is how long can you use or how long is the longest that you can fit.

 

[CMCE]

Jelco- Are you looking for just mufflers? Hydro462 was right, 20" Dynomax Super Turbo's #17749 will quiet your car while still sounding like a muscle car. Most chambered mufflers are on the loud side, and drone. Flowmaster makes a couple of quieter versions- Super 50 & 70 Series, and they control drone nicely. Straight through mufflers have a high tendency to drone, but Magnaflow seems to be the exception to this. And it goes without saying that the longer the the muffler, the quieter.
Drone is rpm specific- usually between 1800-2400 rpm. If your final drive ratio is around 2:56- 3:08, your cruise rpm will be in that range so once again, a turbo style muffler will help.
If you need a complete system, an X-Pipe will quiet it down. But be aware that it will also change the tone. It will sound smoother and more modern. Some like it, some don't. An X is usually good for top end HP without affecting bottom end.
An H-Pipe will quiet it down slightly without affecting tone, and help with bottom end without affecting top end.
There's some good info and sound clips here to help you with your decision- Exhaust 101