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Exhaust 5.7 HEMI Exhaust Discussion


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  #1  
Old 11-21-2013, 11:15 PM
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Question Muffler drilling?

(I think Ive posted this in an acceptable subforum since it doesn't pertain to any one particular engine or year, just general stuff. Please move to better subforum if necessary! )

Whats your guy's take on drilling holes into the muffler? orrrrrrrr removing the muffler? anything really.

Obviously the correct answer is to buy a new muffler or exhaust parts to make it sound how you want it too, BUT, If you couldn't do that, what do you guys think?

Ive heard that it causes internal rusting in the muffler, or something like that.

Ive also heard that it reduces back pressure resulting in HP loss.

I don't know much when it comes to Exhaust stuff. So school me, guys.

I already know its not a "genius" thing to do, so what makes it so bad?

Thanks!
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  #2  
Old 11-21-2013, 11:38 PM
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Drilling the muffler...? Probably the last thing that I'd recommend. Removing the muffler is a better choice (muffler delete)... if those are your only two options, but why not just install one of the many available aftermarket mufflers?

HP/TQ number are inconsequential with any of the aforementioned mods. If the sound is something you're seeking to improve, then get a good muffler, i.e., Magnaflow, Borla, Flowmaster, etc... or not.
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Last edited by SteelTownStang; 11-21-2013 at 11:40 PM.
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Old 11-22-2013, 12:53 AM
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Quote:
Originally Posted by Thebestestdrummer View Post
(I think Ive posted this in an acceptable subforum since it doesn't pertain to any one particular engine or year, just general stuff. Please move to better subforum if necessary! )

Whats your guy's take on drilling holes into the muffler? orrrrrrrr removing the muffler? anything really.

Obviously the correct answer is to buy a new muffler or exhaust parts to make it sound how you want it too, BUT, If you couldn't do that, what do you guys think?

Ive heard that it causes internal rusting in the muffler, or something like that.

Ive also heard that it reduces back pressure resulting in HP loss.

I don't know much when it comes to Exhaust stuff. So school me, guys.

I already know its not a "genius" thing to do, so what makes it so bad?

Thanks!

I had a 2000 Sport 5.9L with a muffler delete. I didn't know it had a muffler delete until the exhaust fell off one day on the way home from work. Brought it to an exhaust shop and they said I didn't have a muffler nor was there one on there before the pipes fell off. Let me say that thing was LOUD. I could set off car alarms by trouncing on the gas. I don't know what the legality of it is in your area but it is a ticket you are never going to get out of when the cop looks and sees no muffler. Maybe a glass pack? Either way I wouldn't drill your muffler.
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Old 11-22-2013, 12:56 AM
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Quote:
Originally Posted by DarthRam View Post
I had a 2000 Sport 5.9L with a muffler delete. I didn't know it had a muffler delete until the exhaust fell off one day on the way home from work. Brought it to an exhaust shop and they said I didn't have a muffler nor was there one on there before the pipes fell off. Let me say that thing was LOUD. I could set off car alarms by trouncing on the gas. I don't know what the legality of it is in your area but it is a ticket you are never going to get out of when the cop looks and sees no muffler. Maybe a glass pack? Either way I wouldn't drill your muffler.
were there no pipes from the muffler delete back? Or was there a pipe replacing the muffler?
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Old 11-22-2013, 07:56 AM
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Quote:
Originally Posted by Thebestestdrummer View Post
(I think Ive posted this in an acceptable subforum since it doesn't pertain to any one particular engine or year, just general stuff. Please move to better subforum if necessary! )

Whats your guy's take on drilling holes into the muffler? orrrrrrrr removing the muffler? anything really.

Obviously the correct answer is to buy a new muffler or exhaust parts to make it sound how you want it too, BUT, If you couldn't do that, what do you guys think?

Ive heard that it causes internal rusting in the muffler, or something like that.

Ive also heard that it reduces back pressure resulting in HP loss.

I don't know much when it comes to Exhaust stuff. So school me, guys.

I already know its not a "genius" thing to do, so what makes it so bad?

Thanks!
Internal rusting of the muffler is the result of water becoming trapped inside it's baffles. When you start your engine from cold, moisture vapor forms, condenses and collects as a liquid inside in the muffler until it is burned off. Short trips in cooler weather do the most harm since the muffler never gets hot enough to dry out or the water expelled as vapor along with the other exhaust gasses. Ever noticed the "exhaust steam" coming from the car in front of you on a cold morning? Popular estimates of today claim that it takes up to 15 miles of driving for a muffler to dry thoroughly. Some mufflers, I think, have 'weep holes' to help alleviate this problem.

All internal combustion engines require some amount of back pressure to perform at their best. So unmuffled pipes do nothing for you but make a lot of noise. Stock mufflers for your model are calibrated for optimum performance.

Drilling holes in your muffler, or removing it altogether are the worst choices. So, as an old saying goes,...." Put a muffle on it"

Dancianne
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Old 11-22-2013, 08:03 AM
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Don't waste time trying to drill holes in it. Either remove it and replace it with a piece of pipe, or buy an aftermarket muffler (you can buy a stainless steel straight through muffler for ~$40 IIRC).
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Old 11-22-2013, 08:35 AM
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Remove it if you want...it sounds awesome but very loud. I can feel some bottom end power loss though. This is on a 4.7
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Old 11-22-2013, 09:34 AM
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Drilling the muffler (or knocking the baffles out with a piece of rebar and a hammer) is an old motorcycle trick. Problem is the sound is usually worse than what you had before and performance goes into the toilet. If you are looking for more sound from your exhaust system do it right and get a quality aftermarket muffler. There are a lot of suggestions on this site as to what works.
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Old 11-22-2013, 10:41 AM
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I did it when I was your age... Since cash was tight I decided to drill 1/4' holes in the muffler one at a time until I got the sound just right. Drill a hole... drive around the block- open it up- back home to drill another hole. Repeat until you are happy.

I knew it was dumb and I knew I'd eventually ruin it with rust or whatever but I ran it for two years and was plenty happy with. I knew guys that were spending hundreds ... and mine sounded just as good and sometimes better that my buddies.

I live in California where the weather is friendly but even I knew to drill my holes on the low end to allow moisture to drain.

Have fun!
Oh yeah!... If you drill a few too many holes you can jam little "joints" of tightly wadded steel wool into the holes to make it a step quieter.
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Old 11-22-2013, 11:12 AM
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Exhaust dumping under the vehicle is a bad idea. My old Gran Torino did that and it gave me headaches in traffic.
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