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Old 12-20-2011, 05:56 PM   #1
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had flowmaster 40 installed , burning smell/smoke?

I went to a shop to have a flowmaster 40 installed and driving around I noticed a horrible burning smell and when I got out to check it out I swear I could see traces of smoke. Now they did spray paint there welds to check for leaks so i'm assuming its just the spray paint burning off? I called them up and they assured me it was fine, I just wanted to see if anyone else had the same problem?

Also is not very loud at all... Everything is stock and they welded it into where the factory muffler was and reattached the piping, I mean its deeper but over like two thousand rpm it almost sounds stock , when I called them up and asked if they could cut out the cat they said it was illegal. I'm actually kind of disappointed with it... Do you think if I cut off the pipe after the flowmaster it would sound better? I don't want it obnoxiously loud but its not much louder over stock, just allot deeper.

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Old 12-20-2011, 06:21 PM   #2
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Buy you a turn down at auto zone. And cut the pipe behind the muffler make sure you leave enough to put the turn down on. And if you don't like you can go back to the muffler shop an get the pipe put back on. It will make it a bit louder.

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Old 12-20-2011, 07:59 PM   #3
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I put a Banks on mine and got the burning smell. They had put part number stickers on the muffler, and of course they burned off pretty quick.
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Old 12-20-2011, 10:00 PM   #4
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this also happened to me when i had my old flowmaster installed. the shop told me that the company puts some kind of grease on the muffler for shipping or something and it would eventually burn off and it did after a few days. and when i put my new banks catback on it smoked for a few days too.
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Old 12-20-2011, 10:11 PM   #5
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The 40s don't seem to be too loud. My brothers have them on their 86 monte SS, and we thought it was stock (they bought it with the mufflers). I don't remember which exact model they have, but it's the louder one. Even without the cat, it's not too loud, but does have a nice rumble, especially at idle. So it seems to just be the 40's on (relatively) low output engines
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Old 12-20-2011, 10:16 PM   #6
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Mufflers take time to break in. I know when i was installing my banks monster it was really quiet. Couple hundred miles later and it sounded real good.
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Old 12-20-2011, 10:18 PM   #7
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I had the 40 installed on mine without a cat and sounds just about right. It's defenitly louder than stock and big improve after the cat was out
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Old 12-20-2011, 11:49 PM   #8
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Mufflers take time to break in. I know when i was installing my banks monster it was really quiet. Couple hundred miles later and it sounded real good.
There's no "break in" with the Flowmaster; it's a totally mechanical baffled/ chambered muffler.
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Old 12-21-2011, 10:00 AM   #9
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this also happened to me when i had my old flowmaster installed. the shop told me that the company puts some kind of grease on the muffler for shipping or something and it would eventually burn off and it did after a few days. and when i put my new banks catback on it smoked for a few days too.
I used to work in a muffler shop. There is a light oil on exhaust pipes and some mufflers. It makes a pretty distinct smell while it's burning off. It's really hard to describe the smell, though. Keep an eye on things and the smell should be gone in a couple days.
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Old 12-21-2011, 10:50 AM   #10
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I mean its deeper but over like two thousand rpm it almost sounds stock
I have had a few Flowmasters on different vehicles and the exterior sound is going to be different that what you hear inside while driving.
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Old 12-21-2011, 11:08 AM   #11
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I'm going to cut of the pipe right after the muffler and see what it sounds like... I noticed the pipe goes up as if to follow the rear wheel well, I was thinking of cutting it at the highest point to avoid water going into it if I get stuck (already happend once lol)

Do you think cutting out some of the pipe will make it any louder?
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Old 12-21-2011, 02:38 PM   #12
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I'm going to cut of the pipe right after the muffler and see what it sounds like... I noticed the pipe goes up as if to follow the rear wheel well, I was thinking of cutting it at the highest point to avoid water going into it if I get stuck (already happend once lol)

Do you think cutting out some of the pipe will make it any louder?
It will be louder while driving since the sound will be resonating under the jeep. But per a sound meter 15' away, the sound will probably be close the same.
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Old 12-21-2011, 03:05 PM   #13
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Had mine cut with a cheap thrush exhaust before right after the skid plate and was not as loud as my flowmaster 40 running out the back and I think when it was underneath it didn't have enough backpressure or sumthin because it sounded awful when shifting gears at high rpms
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Old 12-21-2011, 03:12 PM   #14
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I had a cherrybomb on my old jeep... Cheap and sounded good
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Old 12-21-2011, 04:51 PM   #15
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I'm going to cut of the pipe right after the muffler and see what it sounds like... I noticed the pipe goes up as if to follow the rear wheel well, I was thinking of cutting it at the highest point to avoid water going into it if I get stuck (already happend once lol)

Do you think cutting out some of the pipe will make it any louder?
I don't think it will be any louder. It will be dumping exhaust gases under the tub, not the safest thing.
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Old 12-21-2011, 08:46 PM   #16
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Why don't you take a hammer and a 3 penny nail and punch some holes in the muffler? It will definitely make it louder and there probably won't be enough carbon monoxide leaking into the jeep to kill you
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Old 12-21-2011, 08:52 PM   #17
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I was told that not only the length of pipe but the shape affect the tone and loudness--of course the guy who told me was at the muffler shop and SOLD me a chrome tip.

I also had a "high flow" cat installed--I get lots of compliments on the tone, and loudness. And sounds good inside the Jeep also.

Did I mention I have Flowmaster exhaust?
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Old 12-21-2011, 09:26 PM   #18
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I was told that not only the length of pipe but the shape affect the tone and loudness--of course the guy who told me was at the muffler shop and SOLD me a chrome tip.

I also had a "high flow" cat installed--I get lots of compliments on the tone, and loudness. And sounds good inside the Jeep also.

Did I mention I have Flowmaster exhaust?
The shape of the cut does affect tone. I made up a couple of short pieces of exhaust pipe. One was square cut and one was slash cut. With the vehicle running, you could slip the tips on the exhaust pipe and you could definitely hear the difference. Square cut ends have a harsher tone than slash cut. The reason is the slash cut effectively makes the outlet larger. I don't recommend cutting the pipe up high. You'll end up with fumes inside the Jeep. A turn down will direct the exhaust away from the underside of the tub.
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Old 12-22-2011, 01:10 AM   #19
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High flow cat will also deepen the tone a bit...I replaced a bad cat with a highflow magnaflow on my old truck...big difference in exhaust tone.

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