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Old 05-17-2004, 05:01 PM
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Chevelle Exhaust Question - 3" too loud?

Hi all, I have a question for everyone in regards to trying not to aggravate the "sound police". I am putting together a 72 Chevelle with a 454 slightly modified for routine street duty. I'll probably be driving it about 2 times a week to work. My question is this, would it be too loud for the street if I ran two 3" straight pipes off of my headers through turbo mufflers (or Flowmasters) and into turndowns in front of the rear axle? (would the sound police object?) Has anyone run a combo like this, and if so how did it sound?

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Old 05-17-2004, 06:16 PM
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Re: Chevelle Exhaust Question - 3" too loud?

Quote:
Originally posted by JamesRS
Hi all, I have a question for everyone in regards to trying not to aggravate the "sound police". I am putting together a 72 Chevelle with a 454 slightly modified for routine street duty. I'll probably be driving it about 2 times a week to work. My question is this, would it be too loud for the street if I ran two 3" straight pipes off of my headers through turbo mufflers (or Flowmasters) and into turndowns in front of the rear axle? (would the sound police object?) Has anyone run a combo like this, and if so how did it sound?
I have a 72 with a solid roller 355, 3" exhaust and flowmasters

If you run the exhaust out the back, ( its kinda tough to get the 3" exhaust over the rear axle) It may not be as loud as mine, way too loud for your application... I dumped mine in front of the rear axle and its very loud..

I would suggest the best turbo type mufflers you can find that will not hinder your BB..

If you find something you like let me know, Id like to keep the sound police off me as well...

2wld4u
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Old 05-17-2004, 08:52 PM
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Get Dynomax Hemi Super Turbos, they do and excellent job killing noise and surprising out do just about every brand performance wise.
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Old 05-17-2004, 08:55 PM
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Flowmaster 50 series 3 chamber 3 inch in/out work fine for me on one of my cars
Deep, not too loud at idle but at WOT Look out!
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Old 05-17-2004, 09:16 PM
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I have 3" Exhaust through 3 chamber flowmasters and I love the sound! It is a bit loud, but thats the way I like it. My buddy also has the same setup on his 76 Grand Prix 455.

If you go into a parking garage, you will set off EVERY car alarm guaranteed
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Old 05-17-2004, 09:23 PM
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JamesRS,
I have a 408BBC w/ 2-chamber Flowmasters and a complete 3" TorqueTech exhaust all the way out the back and it is LOUD! I don't know what your tolerance is for noise but I would highly persuade you against turn downs before the axle. Run it out the back if you can. I'm strongly considering switching to 3-chambers or something else as its too much for me. I might have to look into the Dynomax Hemi Super Turbos.
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Old 05-17-2004, 10:19 PM
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would he get proper exhaust scavenging using 3" pipe?
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Old 05-18-2004, 06:18 AM
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Quote:
Originally posted by Ghetto Jet
Get Dynomax Hemi Super Turbos, they do and excellent job killing noise and surprising out do just about every brand performance wise.


hmmm, I might just have to try those, what's the price on those?
cheaper/higher than flowmasters?

thanks, 2wld4u
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Old 05-18-2004, 08:18 AM
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much cheaper actually, about $42 a piece from Jegs.
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Old 05-18-2004, 10:13 AM
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Hmmm, sounds like I need to reconsider this then. I've always liked the sound of turndown exhaust systems, and the 2 1/2" systems always seemed to flow good for my small blocks in the past. I guess a 3" system it might be a bit too loud. Bummer. I could always go with a 2 1/2" system like I have in the past, but I was hoping for more flow for my Big Block. This is the first big Bowtie I've built, and I want it to breath right.
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Old 05-18-2004, 10:26 AM
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You should consider a complete 3 inch mandrel bent system. A few companies make them for your Chevelle, the cost isn't that bad considering what a local shop would charge to make a compression bent system.
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Old 05-18-2004, 05:11 PM
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JamesRS, Don't rule out the 3" system because it is loud with X brand mufflers or turned down before the axle. Both of those factors can equal a very loud exhaust note. TorqeTechnologies makes excellent 3" mandrel bent exhaust systems that will route over the rear axle and out the back and fit. I have one and it fits nice. If you want a 3" system you can always give them or another company a ring and ask how how much, how loud, etc. I'm happy with my exhaust system, just wish it was a little quieter which I blame on the mufflers more than the pipe size in my case. Good luck!

www.torquetechexh.com
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Old 05-18-2004, 06:41 PM
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Quote:
Originally posted by 68chevelle_ss
JamesRS, Don't rule out the 3" system because it is loud with X brand mufflers or turned down before the axle. Both of those factors can equal a very loud exhaust note. TorqeTechnologies makes excellent 3" mandrel bent exhaust systems that will route over the rear axle and out the back and fit. I have one and it fits nice. If you want a 3" system you can always give them or another company a ring and ask how how much, how loud, etc. I'm happy with my exhaust system, just wish it was a little quieter which I blame on the mufflers more than the pipe size in my case. Good luck!

www.torquetechexh.com

or you can turn a 180, and do what I have done on several cars in the past, run a DR. gas X-pipe and spin trap mufflers...

www.drgas.com

the sound is awsome and this system is surprisingly quiet even a WOT... this is what Im trying to save money for on mine, hopefully I'll have this system back on there before the end of summer...
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Old 06-13-2004, 12:01 AM
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are cut outs an option?

Has anyone used the "Mr gasket" exhaust cutouts

http://store.summitracing.com/partd...part=MRG%2D5424

I am hot rodding an 84 caddy hearse with a 454 and I think 80" glasspack sidepipes are almost obligitory for asthetics and tone, however my local law enforcement does not agree. I know a lot of friends who say the tickets can get expensive. I would like a basic exhaust with a quiet muffler and maybe even a cat converter or something to help me pass emissions, but have the option to pull the cable and route exhaust to the sidepipes. I cant bring myself to just use dress up pipes.
I'm afraid these cutouts will deteriorate with heat or leak or something. If they work it would be great (except for paying for 2 exhaust systems. I guess I would need 2 w/ 2 pull cables (could I use 1 cable hooked to both?) Hopefully someone has used these. Any advice appreciated.
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Old 06-13-2004, 12:05 AM
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cut outs continued

link didnt work heres a pic

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