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Exhaust 5.7 HEMI Exhaust Discussion


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  #31  
Old 11-25-2013, 11:04 PM
THasse THasse is offline
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Since you already know you don't want the stock muffler on there, I see no reason to even think twice about it until you put on a nice system. And for the back pressure, don't go crazy with the holes and you'll probably be just fine. I doubt substantial hp loss, i.e. noticeable will be there.
FWIW though, AutoZone has cherry bombs for like $30.
Also, for fumes under the truck, I cut mine off right behind the rear axle to dump under the box and I love it. Almost complete system, but still nice and trim. Cutting the resonator off (I had an 05, idk if you have a separate resonator or not) gave it a simple couple of dB.
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  #32  
Old 11-26-2013, 08:35 AM
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I too have it dumped post..I want my peace and quiet during normal driving and hear it when I want to be heard...

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  #33  
Old 02-20-2014, 12:28 AM
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Buy a glasspack and some clamps. it will cost you less than $100 to replace your muffler and its easy to do yourself. I did mine in about 2 hours. (with a hacksaw mind you). Ideally, you would use an electric saw and have a way to get easy access to your muffler. Good luck and don't drill holes!!! Wait and save some money.
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  #34  
Old 02-20-2014, 10:24 AM
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Quote:
Originally Posted by Black1 View Post
Exhaust dumping under the vehicle is a bad idea. My old Gran Torino did that and it gave me headaches in traffic.
+! If you want to delete the muffler be sure to replace it with piping at least. You can melt e-brake cables and other stuff under there by dumping hot gas (don't ask me how I know...)
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  #35  
Old 02-20-2014, 12:21 PM
sconnie89 sconnie89 is offline
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Good point, I actually had to use a section of a tailpipe extension because the glasspack is 20" and my muffler is over 23". I cut the extension a bit too short to fit and now I'll have to get another piece to cut to the right length so I can put my tailpipe back on. Guess I'd better do that sooner rather than later.
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  #36  
Old 02-21-2014, 07:00 AM
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Default Holes in mufflers

I'll have to admit to my ignorance about this holes in muffler stuff since I won't crawl under a vehicle, nor will shops allow me into their service bay if it's up on a rack for service. In spite of my lack of knowledge, I'd like to comment on the subject anyway:
a. If automotive companies do indeed install mufflers with "weep holes" in their new vehicles, I'd have to wonder why. It seems only logical to me that just about 100 percent of all water and vapor will be either blown out the tailpipe or cooked off inside a hot muffler, even after just a short drive. Now I've seen muffler cut-a-ways as used for demonstration purposes, and it is beyond me to imagine how water trapped between the different chambers inside a muffler is going to somehow manage to escape thru some weep hole in the back end cap. Only a weep hole located beneath each chamber would have a chance of that happening.
b. For those of you who would drill your own holes, my same logic above applies. And anyway how would you know where to drill since you can't see where you are drilling into. Further, I think that most mufflers made today use steel that has a galvanized coating applied to retard rust. If you drill into that metal, you will most assuredly leave holes which have no protective coating around the edge. This would mean that over time, your self made "weep holes" will get bigger and bigger all the while. Do you think this practice will somehow make your muffler(s) last longer? Just seems to me that by drilling holes in your muffler, all you are doing is to create the equivalent of a worn/rusted out muffler which needs to be replaced as soon as possible.
c. Regardless of factory weep holes or self inflected injury, do you enjoy the effects of carbon monoxide? If it's just a little extra noise you want, then go to a good muffler shop, explain that to them and ask for recommendations. I would trust my confidence and health to their professional experience and skill over hauling out my drill and just boring away. As for C-clamping your exhaust system components together, just my opinion, but I'd settle for nothing less than an airtight welded seal at every connection. Isn't that the way Ram and every other car maker does it?
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  #37  
Old 02-21-2014, 08:20 AM
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alot of car manufacturers do clamp their mufflers on..
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  #38  
Old 02-21-2014, 09:35 AM
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Hi All,

Let me clarify something here that seems to be getting confused. Drilling out a muffler does not mean poking holes in the outer casing. It means opening holes in the baffle plates. Coming from motorcycles and having done this on several bikes, you need to understand that if you poke holes in the shell or outer case of the muffler you will get a ticket and/or fail inspection. The whole concept is to redirect exhaust gasses around the baffles when they start to restrict back pressure on acceleration. I had a 2003 Triumph Sprint ST that I put a 1" hole into the rear and center baffle plates. It sounded mellow when I was being nice and it definitely got peoples attention when I was being naughty. It also was dynoed and added about 5% because at idle and lower pressures most of the exhaust would still follow the baffles, but when the pressure built up at higher throttle more exhaust would go through the holes that offered less resistance at high flow. It is the shade tree version of flow-through mufflers. Don't know how well poking holes in the case will do, but if it were me I would be drilling a 1-2" hole in the rear baffle plate and see how that works. BTW I did that with a 1" hole saw and two 12" extensions on my Sprint.

Whatever you decide to do good luck and have fun.

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Last edited by preachp; 02-21-2014 at 09:43 AM. Reason: clarification
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  #39  
Old 02-21-2014, 10:26 AM
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then you must mean on a chambered muffler like a flowmaster...it doesn't matter on the straight thru designs like magnaflow..
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  #40  
Old 02-21-2014, 08:45 PM
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Hi chefred,

The idea is to offer the gasses as straight a path as possible without being obnoxiously loud. And yes the comparison as I stated earlier would be to effectively create a shade tree version of a flow through muffler.

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