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1989 Fleetwood Brougham d'Elegance|2018 Chevy Colorado Z71
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Discussion Starter #1
I was at a concert the other day and while hanging out outside after the show I saw an 80's Fleetwood like mine leaving the show. Couldn't tell what year it was since it was dark but damn did it sound good. I know all about Flowmaster and all their fine products so that's the brand I wanna go with. What parts should I get to give my car a nicer sound? Muffler and Cat? Maybe just a muffler or just a cat? I don't wanna go dual I wanna keep the stock look and the stock pipes. I'm willing to part out with the muffler and Cat if need be. Any thoughts?
 

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94 FWB, 93 SDV, 94 FWB (sold), 90 Brougham (sold)
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Yeah, the cat has to go. If you want a real nice "tinny" sound, like the GT 500 in "Gone in 60 Seconds", Flowmaster is your muffler. Borla also makes a very high quality muffler that has a unique sound as well. You could put a glasspack in place of the muffler, or you could also straight-pipe it. Straight-piping it is the easiest, and it'll sound decent for sure.

Brian
 

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1994 Sedan Deville
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Get duals. Not only will it sound real nice but it should boost hp a little. Maybe from 140/150 to 160/170. But about the muffler and cat you could get some less restrictive models and that will improve sound as well. I'm sure the more experienced guys will chime in with their advanced knowledge and correct me if I'm steering you in the wrong direction.
 

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1989 Fleetwood Brougham d'Elegance|2018 Chevy Colorado Z71
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Discussion Starter #4
I'm gonna start pricing Flowmaster mufflers tomorrow when I get a chance. I don't wanna go dual, I wanna keep the original look of the car.
 

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1995 ETC, 75 Deville, Cad500 powered 73 Apollo, 94 Mark VIII
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Flowmasters sound nice but are far from being the masters of flow. Since you're probably not very interested in the performance of the exhaust system (I mean it's a 307 and you're keeping it single...,) a flowmaster would be a good muffler choice. If you were looking for performance I'd steer you away, towards a straight through design. IMO a glasspack and for sure a straight pipe would be way too loud for a Cadillac.
 

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1989 Cotillion White Brougham
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321 Posts
Got a Flowmaster the first week I had my car and while there is a little difference, it's not much, unless you know what to listen for. There's a rumble to the thing but not obnoxious or even all that loud. I think I notice more interior rumbling than I do exterior, but it does sound more powerful overall. Only wish it really WERE more powerful! =D
 

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94 Fleetwood Brougham
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7,534 Posts
I put a Hooker dual exhaust for a GN Regal on my 85 Cutlass, and it was an awesome sounding exhaust for a 350 Olds. I mean it sounded great. Inside the car, quiet. Outside, authority. $290 at the time. Cat back exhaust with no cat, comes with test pipe. It has the Hooker Super Comp mufflers. So shoot for 2.25" pipe and those mufflers for a great sounding exhaust.

Any Impala SS exhaust might be made to work with some effort. Or get a custom duals and just add in the Hooker Super Comp's.

Listen to my 350 Olds here: http://tlentz.oldsgmail.com/hooker_exhaust.html or direct
http://tlentz.oldsgmail.com/tm_exh.wav
The rest of the site which has some good info on 307's is http://tlentz.oldsgmail.com.
 

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1989 Fleetwood Brougham d'Elegance|2018 Chevy Colorado Z71
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Discussion Starter #8
cmgrafmc said:
Got a Flowmaster the first week I had my car and while there is a little difference, it's not much, unless you know what to listen for. There's a rumble to the thing but not obnoxious or even all that loud. I think I notice more interior rumbling than I do exterior, but it does sound more powerful overall. Only wish it really WERE more powerful! =D
Really? The Flowmaster didn't make too much of a difference? Wow. I wonder if it's because of the resonator. That's a sepirate piece right infront of the tail pipe. Maybe that needs to be messed with?
 
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Im running duals with magnaflow's. Its loud.........too loud!. I liked it at first cause it was different but in all honesty I'm looking to go back to stockish Turbo mufflers or something. The exhaust shop said it would be quieter than Flowmasters and they were dead wrong. Car sounds like a 5.0 Mustang w/exhaust but its got this real annoying raspy sound to it. Soon as I get her back on the road I'll be getting something quieter.
 

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1995 ETC, 75 Deville, Cad500 powered 73 Apollo, 94 Mark VIII
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No kidding magnaflows are louder than flowmasters. You can look at them, well through them, and tell that. They're why my ETC kinda sucks on the highway.
 

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1989 Cotillion White Brougham
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I think the Flowmasters are a good compromise between good sound outside and lower noise inside. There is a difference but unless you hear the stock muffler and the Flowmaster next together, you may not be aware of it once you're used to it. It sounds healthy but not overpowering, which is, I think, what you'd want from a Caddy like this.
 

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1974 fleetwood 75, 1980 sedan deville, 1970 eldo
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319 Posts
I think alot of it depends on which flowmaster you get. I have an 88 chevy with a 350 and a single flowmaster 40 series with no cat and it sounds like a mild drag car. Ive got an 89 chevy with the same muffler, but with a cat and it sounds alot louder than stock, just not as mean as the 88. a friend of mine has a 77 buick electra with a 403 with dual flowmaster 40 series mufflers and no cats and I love it. its alot louder than stock, but not annoying.
 

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01 STS, 92 Roadmaster, 01 SLS-sold, 88 Brougham-crushed
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i did a muffler delete on my 88 brougham and it sounds just how i like it. it is quiet at idle, but when you get on it, it responds with a nice deep growl. i just took out the muffler and put in a piece of pipe. i think it sounds great and have gotten many comments from other people, such as "holy s***, what do you have under that hood". lol. i never respond, let them think what they want. only i know that it is a 307.
 

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1989 Fleetwood Brougham d'Elegance|2018 Chevy Colorado Z71
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Discussion Starter #14
pimpin88 said:
i did a muffler delete on my 88 brougham and it sounds just how i like it. it is quiet at idle, but when you get on it, it responds with a nice deep growl. i just took out the muffler and put in a piece of pipe. i think it sounds great and have gotten many comments from other people, such as "holy s***, what do you have under that hood". lol. i never respond, let them think what they want. only i know that it is a 307.
Seriously?! That won't mess with emissions at all? Can you send me some form of a sound sample of this? What you described is what I want. Not loud but gives a nice growl when you accelerate.
 

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94 Fleetwood Brougham
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Mufflers aren't emissions devices, and they are after the cat. No issues!

BUT, for safety, they are installed for fire. So you can run into that issue. But I doubt it. Hogs are 10X louder and they guy by with it.

Listen to the sound clip of mine up in this thread. That is what a stock 307 would likely sound like. You will like.
 

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1989 Fleetwood Brougham d'Elegance|2018 Chevy Colorado Z71
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Discussion Starter #16
I do like that sound actually, but I don't wanna drive around without a muffler. NJ is very strict about that.
 

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its really not loud at all, espcially in the car, and its got a nice rumble to it during acceleration. right now, i took off the pipe where the muffler was, and the pipe that would go from the muffler out the rear of the car because they rusted out. the so exhaust dumps out right about where the front doors meet the rear doors. still not very loud but sounds great.

the cat does a lot of quieting and if you have a resonator in the tail pipe, even more, but you will still have a nice low v8 rumble. and the muffler not being there will cause no emissions problems.

personally i love the sound, but i dont know how i would be able to get a sound clip up for you.
 

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94 Fleetwood Brougham
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Mine was great, quiet, exhaust almost dead silent in the car, outside, healthy sound, never a complaint, now way loud enough to have any complaints. Just a nice sound that sounds classic Olds.... Sorry, I think Olds engines have always had the best sounding exhaust.
 

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1989 Fleetwood Brougham d'Elegance|2018 Chevy Colorado Z71
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Discussion Starter #19
Me too. I think Olds when I think of how I want my car to sound. I've got the engine, all I need is the exhaust.
 

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N0DIH said:
Mufflers aren't emissions devices, and they are after the cat. No issues!

BUT, for safety, they are installed for fire. So you can run into that issue. But I doubt it. Hogs are 10X louder and they guy by with it.

Listen to the sound clip of mine up in this thread. That is what a stock 307 would likely sound like. You will like.
Sounded pretty nice, and loud. Nice stereo cop caller you have there. Reminds me of when I was a kid and had a '69 camaro. Was getting pulled over 2-3 times a day sometimes. Kept the headers, but put '62 409 mufflers (2 1/2" in and out) on it with a balance pipe after the header collectors. QUIET !! it was. Cops didn't even look at me and I had a ton more fun with the car. Dual exhaust pulses at 133 pulses / sec. each side, single exhaust pulses at 266 pulses/sec. which sounds smoother to your ears. The balance pipe lets each tailpipe pulse at 266. For some reason, the larger the balance pipe, the quieter the system. Makes you smile when you leave the loud exhaust car in your dust and they can't believe it. Eventually gonna put a similar system on my caddy, after I figure out how to put this corvette rear end in it.
 
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