What rear mufflers are you running if not stock?

teamzr1

Supporting vendor
If I'm right the Magnaflow mufflers are of the absorbsion tube type - so perforated tubes within the muffler which is packed with sound absorbing wadding material. After a few months crap, carbon, oil etc will gradually permeate the inside of the muffler, making it gradually noisier. It should really crackle when you get on the loud pedal and run up the revs.......but not just yet - be patient!

On the subject of exhaust sound levels, I came across this attached PDF below from Canada as not only the sound levels allowed,
how the tests are done and how the cops there were ticketing people, though incorrectly doing the tests
 

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Mad4slalom

Well-known user
If anyone is interested, the Dynomax Bullets are on eBay...

must be an age thing but now in my early 60’s I find loud exhausts just annoying . I quietened down the cannons on my beach buggy mainly as i felt I was annoying other people. Its a fine line between throaty / sporty or nuisance. The latest craze with the saxo brigade seems to be the machine gun cracking , popping and banging on the over run . So they will drive by revving the motor then it bangs off rapidly and pisses everybody off yet they are thinking everyone is impressed. We all did it , remember removing the baffles from our mopeds and thinking we sounded great!! Very happy with the subtle throatiness of GM’s stock muffler.
 

Mad4slalom

Well-known user
Thanks, will have a look. One question, do they sound utterly gorgeous and bad-ass, without me sounding like a 13 year old. TVR Griffith volume and 'wow' is my absolutely minimum base line. More wow and a bit louder even better.

The cherry's I have on the '80 back in the day had a bit too much fffft-fffft-fffft noise to them - not very 'clear', whereas Flowmasters sound like a rock in a washing machine at idle if you like that thing.

I'm still tempted with the Dynomax bullets, as ultimately, I want it to sound like this.... (35 secs - 45 secs) pretty much nails my level of desired ''bad-ass'.


For the record, the car will only ever be driven on short local trips for a bit of fun when the roads are clear and dry. Long journeys, passenger conversations, the ability to hear the 'crackle-master 2000' stereo are not factors.
i was just saying how too loud an exhaust is annoying but that video , actually sounds pretty epic, what motor is the red vette running ? 👍
 

Last triumph

Well-known user
i was just saying how too loud an exhaust is annoying but that video , actually sounds pretty epic, what motor is the red vette running ? 👍
Not sure, but definitely tuned.

Lots of people said how amazing my '81 sounded on the bullets, pretty much like the red car but half the power and revs.
I'm just getting to that lower profile stage in life where 'time and a place' is forming part of my vernacular.
 

CaptainK

CCCUK Member
My neighbours must be happy with my Vette's sidepipes - I've never heard them complain about how loud they are ............ :ROFLMAO:
 

Nassau65

CCCUK Member
That nice V8 burble was always a trait of American cars, and I personally do like side exhausts. I’ve been in a few cars that are a bit too loud on the ears after a while tho.
 

GiuG

Well-known user
Hi there, I have the basic original type of mufflers, I'd love to give new voice to my Vette soon. I'd like to remove the silencer and put some kind of newone or no one :) someone suggested Jetex Exhausts instead of the cherrybomb glass flex. Are there any pipe/resonator that make the sound very very deep? I don't mind loudness, I'd want to avoid the metallic high pitch of the straight pipe that sound like an Italian espresso machine. Also cause mine is a 1975 I suppose it has the 2.5 inches system, you think that enlarge the end to 3 inches, makes some difference in the sound? Thank you in advance for your suggestions.
 

Last triumph

Well-known user
Hi there, I have the basic original type of mufflers, I'd love to give new voice to my Vette soon. I'd like to remove the silencer and put some kind of newone or no one :) someone suggested Jetex Exhausts instead of the cherrybomb glass flex. Are there any pipe/resonator that make the sound very very deep? I don't mind loudness, I'd want to avoid the metallic high pitch of the straight pipe that sound like an Italian espresso machine. Also cause mine is a 1975 I suppose it has the 2.5 inches system, you think that enlarge the end to 3 inches, makes some difference in the sound? Thank you in advance for your suggestions.

If you want really deep, you'll need to combine straight through design like a glass pack, but with a decent size and length body to absorb as much of the high frequencies as possible. Smaller diameter cases on typical glass pack round silencers are plenty loud, but do not absorb as much of the higher frequencies, hence the bigger the casing, the better for achieving the deepest sound.

Something like a Dynomax 17222 should give you what you need - it has the biggest silencer case you'll fit in the stock location and is pretty similar in size to a stock silencer to aide location and fit, but is straight through. Dynomax 17222 DynoMax Ultra-Flo Welded Muffler | eBay

I had a 3" system on my '80 and have a 2.5" system on my '81 - there is zero perceptible difference in the sound to my ears, but with a 3" system you will carry extra weight and suffer less ground clearance - 2.5" is all you need.
 

Roscobbc

Moderator
I have used the Jetex mufflers on a number of American cars over the years and for the first 10 years or so on my 427 powered C3. Mufflers like Cherry Bombs use glass fibre wadding which tends to deteriorate quicker than ceramic or stainless wadding. I sized up a pair of oval 2 1/2" steel mufflers that were very close in overall dimensions to stock C3 mufflers. Simply took them along to the exhaust specialist to fit to the existing pipes. After a 6 month or so period they will get a little louder but always a deep not too intrusive rumble which would turn to a crackle when giving wellie. And yes the longer the muffler better in terms of sound attenuation.
 
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