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How much louder is the Flowmaster 50 series compared to stock muffler (90 Blazer)?

Jessie James

Jessie James

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I picked up a replacement exhaust system for cheap which happened to include the Flowmaster 50 series muffler for my 90 Blazer (350). I'd be inclined to put it on if it will help with power and MPG, but not if it's going to be significantly louder than stock. Realistically, it has to be quiet enough that the wife won't complain and I can hear the stereo.

For reference, I'm 40, so I really don't need loud any more. :)

So ... if anyone has on opinion, or better yet a sound/video clip of their 90'ish Blazer with a 50 series that would be great!
 
Which 50 series did it have? I had the big block 50 with single 3" and aftermarket cat in my 80 k5 had a pretty quiet low rumble. My buddy had the 50HD 3" with no cat and it was pretty loud.
 
Well, I don't know what is in there now, but it's waaay too loud.

Here is what I bought:

http://www.amazon.com/gp/product/B000CNHD5A

It has a 3" inlet and 3" outlet, and I am using a cat with it. I'm fine with a low rumble, but what I have now rivals an open-pipe Harley!
 
I have dual 3" super 44's on my 75 with a mild 400sb. You want to talk about loud! I cant even hear the tsl's when on the skinny pedal. I'm only 34 and still like it loud.:saweet:
 
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I had a 50 series Flowmaster on my 2002 Avalanche and it had a nice low rumble, but was not too loud at all. I am 43 now and and I just sold it a couple years ago. I know what you mean, I don't need loud I just like a good exhaust note.
 
dbabicky said:
I had a 50 series Flowmaster on my 2002 Avalanche and it had a nice low rumble, but was not too loud at all. I am 43 now and and I just sold it a couple years ago. I know what you mean, I don't need loud I just like a good exhaust note.
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Hm, this sounds like it might be okay. I don't mind a nice subtle exhaust note, but I don't need anything that sounds like it's not stock.
 
Ok, I'll give it a shot. Hope you guys are right or the wife will be having words with ya! :haha:
 
I had a 50 series on mine and it was ok at idle. But when you get on the gas or drive on the freeway, you can definately tell its not stock!
 
How much louder than stock? I know it's hard to explain, but if I have to turn the stereo up to overcome the muffler, then it's going to be too loud for me...
 
At idle it was not much louder than stock. Since mine has no top, it was probably louder than a truck with a closed top, but still noticably different than stock. It's pretty hard to beat stock mufflers for noise levels.

I have a friend with 40 series and mine was just a tad quieter than his 40s, but neither have a catalytic converter. I've heard those make a big difference. I say give a shot but have them leave enough room for a bigger muffler in case it's too loud. Then they should be able to cut it out and replace it with a larger/quieter muffler. I'm happy with the magnaflow I got after driving with the 50s for a while. There's a huge difference on mine.
 
Look up neworder18 on youtube (that's me;)) there I have a couple vids of my Yukon before and after a Flowmaster 50 series swap. At idle you can hardly tell it's there, but get on it, you know. It isn't what I would call loud, but then I am 24, so, yeah...

There is a bit of resonation between ~1,300-1,900 rpm, and above 2,000 rpm, it really quiets down, at least the resonation does. And I feel I got an honest 1-2 mpg on the highway, plus quite a bit more torque.

Here, I'm bored and not got much else to do:doah:


 
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A quick search on YouTube brought up this '89 blazer with a 50 series muffler... sounds pretty mild to me.



If you're really worried about it I'd go to an exhaust shop and talk to them in person. They do it all day every day so I'm sure they could set you up with a non restrictive exhaust that isn't too loud for ya'.




.
 
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a 50 series is substantially larger than a 40 series... which suggests to me, much tamer on the noise level...
 
Heres some flowmaster super 44s with long tubes , all 3 inch.... I have flowmaster 50 series duals 2.5 on my 03 2500hd and its not loud but deep. (in the video the right front hub broke so it doesnt spin)



 
Hey, thanks for finding those videos, it never occurred to me to look on YouTube. Some of those seem perfectly fine, and others seem a bit loud.

Decisions, decisions!

I think I'll give it a try, and if it is too loud I'll just have 'em cut it out and put the stock one in. :)

Thanks guys!
 
that one you bought on amazon looks pretty good for what you are lookin for.good sound at idle or cruising,but louder when you get on it.if its too much you can go with a stockish turbo muffler.i had them on my blazer and they flowed good and wasnt too loud.i had them put on at meinikee for 200 bucks true duals from the header back.now i have the flowmaster 40 series.they are much louderand flow much cleaner in my opinion,but as said you can here me comin from a mile away.even at idle my truck shakes the house.haha.
 
Same here on the Super 44s. I have a single 3" exhaust on a 410 sbc (440hp,510 ft lbs torque), and too loud for me. Thinking of swapping out w/ a 50 series muffler. Nobody rides along side of me for very long....and that good be a good thing.
 
if the muffler is not to dirty or rusty look on the ends. there is a stamped in part # on it. this will be the exact model of the muffler when you look it up. it will tell you series/inlet size & location/outlet size & location.

hope this helps.

and i had 2 3" 40 delta flows on my old 96c3500 350. it was fun. but long trips it had bad inside noise.

then i got a 50 suv 2 inlet 2 outlet and swaped it in. much much better. now i could drive it in peace up the highway.

last 2 i got have been 50 series. and off ebay like new or missing box new for 1/2 price.
 
My truck is rust central, so I am not sure about finding the part number on the existing one but that's a good idea. Anyway, if I use those band clamps, it'll be easy to swap it out if it's too loud. I was going to use those u-clamps or weld it, which are far more permanent, which was why I wanted to be as sure as possible about what I was doing. With the band clamps, it totally doesn't matter, so I am glad you all are so knowledgeable!
 
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