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Old 01-24-2015, 05:22 PM   #36
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Originally Posted by Diehard View Post
In the spirit of experimenting, which I think is great, I was looking for some pictures that might show the inside passageways of these mufflers. I would think that would be helpful.

Also, don't forget you can plug the holes and try different locations before throwing them away.

The washer thing sounded like it may be worth a try.

I think it's cool as hell you're making science to it. I doubt you'll find anything new but experimenting is half the fun.
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Old 01-24-2015, 05:30 PM   #37
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A modified exhaust was perfect on my Suzuki M50, better than eny aftermarket. Worth a try.
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Old 01-24-2015, 05:50 PM   #38
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At some point I am gonna try this just for fun.

I think he said he was attracting too many ducks and had to remove it. LOL
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Old 01-25-2015, 12:14 AM   #39
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Folgers cans would probably be quieter.
Add some coffee beans to gas tank, let the motor grind em, and you my friend have a perfect recipe of dark roast morning coffee coming outa these Folger's!! Buh bye Starbucks!
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Old 01-26-2015, 12:09 PM   #40
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I think he said he was attracting too many ducks and had to remove it. LOL
I laughed so hard at this!!
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Old 01-26-2015, 12:23 PM   #41
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Ok, I picked up the test subjects Sat. afternoon. I'm on a 40hr shift until Wen, so while I'm on shift I'm going to work on the process on paper.


While googling images of internal layouts, I have found someone else that has done this and was very happy with the results. His process involved cutting a square off of the top, then cutting out part of the final pipe and one of the baffles, and TIG welding the top back on. I don't have a TIG (yet), but have access to one. This may be what I have to do to achieve the results I'm hoping for, but I'm going to try my theory first.


Our factory mufflers have a glass pack in them as the last pass. It looks like I should be able to angle in a long bit and punch out a good portion of this. I'll update more as I continue to study and get ready to start modifying.
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Old 01-26-2015, 12:32 PM   #42
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like i mentioned before, if you are able to put some washers in between bolts before the muffler, leaving a little opening in the pipe before the exaust hits, im curious to know how that sounds. assuming it is possible. i dont know the o2 sensor locations on the 3.7.

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Add some coffee beans to gas tank, let the motor grind em, and you my friend have a perfect recipe of dark roast morning coffee coming outa these Folger's!! Buh bye Starbucks!
Meanwhile, in an alternate universe - "Check out the muffler on that civic. what a coffee burner!"
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Old 01-26-2015, 12:35 PM   #43
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I have 2 pairs of stock mufflers laying around. I'm definitely subscribing to this to see how it goes.
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Old 01-26-2015, 12:58 PM   #44
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Originally Posted by RedPony14 View Post
Ok, I picked up the test subjects Sat. afternoon. I'm on a 40hr shift until Wen, so while I'm on shift I'm going to work on the process on paper.


While googling images of internal layouts, I have found someone else that has done this and was very happy with the results. His process involved cutting a square off of the top, then cutting out part of the final pipe and one of the baffles, and TIG welding the top back on. I don't have a TIG (yet), but have access to one. This may be what I have to do to achieve the results I'm hoping for, but I'm going to try my theory first.


Our factory mufflers have a glass pack in them as the last pass. It looks like I should be able to angle in a long bit and punch out a good portion of this. I'll update more as I continue to study and get ready to start modifying.
Which OEM muffler did you get? from a manual or auto. Substantial difference in sound to begin with.
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Old 01-26-2015, 06:18 PM   #45
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They were from an auto.
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Old 01-27-2015, 08:24 AM   #46
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Add some coffee beans to gas tank, let the motor grind em, and you my friend have a perfect recipe of dark roast morning coffee coming outa these Folger's!! Buh bye Starbucks!
lmao hold the sugar.
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Old 01-27-2015, 08:36 AM   #47
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10-4 on hold the sugar. Bump!
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Old 01-27-2015, 11:21 AM   #48
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Originally Posted by fenixignition View Post
like i mentioned before, if you are able to put some washers in between bolts before the muffler, leaving a little opening in the pipe before the exaust hits, im curious to know how that sounds. assuming it is possible. i dont know the o2 sensor locations on the 3.7.
I'm intrigued, but honestly have no idea what your talking about. From what I can tell it sounds like baffles in a supertrap motorcycle muffler, but I could be miss understanding you. If you could provide a little clarity, or a picture?
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Old 01-27-2015, 02:05 PM   #49
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I'm intrigued, but honestly have no idea what your talking about. From what I can tell it sounds like baffles in a supertrap motorcycle muffler, but I could be miss understanding you. If you could provide a little clarity, or a picture?
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Old 01-27-2015, 09:07 PM   #50
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I'm intrigued, but honestly have no idea what your talking about. From what I can tell it sounds like baffles in a supertrap motorcycle muffler, but I could be miss understanding you. If you could provide a little clarity, or a picture?
This is how I interpreted it...
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Old 01-28-2015, 04:15 AM   #51
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Pretty much. Might sound awful on different engines but I remember people doing it with a subaru legacy and it sounded deeper and a bit louder. So I was curious how it might sound on a 3.7

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Old 01-28-2015, 11:44 AM   #52
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Pretty much. Might sound awful on different engines but I remember people doing it with a subaru legacy and it sounded deeper and a bit louder. So I was curious how it might sound on a 3.7

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I knew people who did that on 370zs as well. Essentially your creating a massive exhaust leak to bypass the muffler for noise. If you would going to do that probable better off to take the mufflers off and put turn down pipes so the exhaust is getting directed downwards.


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Old 02-01-2015, 09:48 AM   #53
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Finally getting an update. I've been taking my time, because I want to do the best test possible. I haven't been able to get an exact explanation for what the difference between the auto and the manual stock muffler, but everyone says the manual is louder. From the outside, there are clear differences in the tips, and the manuals look wayyy better. The auto has a pipe sticking through a short tip, where the manual has a longer tip that is tapered and smooth on the inside.

Before I start modifying the test exhaust I am going to use a DBL meter app on my iPhone measured at a set distance from the rear and inside my car at several different RPMs for both to get solid baselines for comparison.

In keeping with the budget intent for this project I have located a set of 25" drill bits at Harbor Freight that will work perfect for $10!! Now to get the projects done for my customer so I can work on mine.
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Old 02-01-2015, 11:03 AM   #54
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Try this first

As long as you still have the factory X- pipe on it. Just drill out the passenger side and not the drivers side. Start it up and take a drive. I'm pretty sure you may like the sound and you won't lose any torque.
Tip: If you get a regular hole drill the part you drill out will be in the drill bit and not rattling around in the muffler. Go to Sears and ask about the drill bits I'm talking about. They come in many sizes and will work much better then a bunch of small holes.
It does sound like a fun project and I can't wait to see your results.
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Old 02-01-2015, 11:04 AM   #55
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Interested to see the results. The manuals do look better. Always thought my exhaust tips looked like someone was asleep on the line as the tips were welded on.
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Old 02-01-2015, 12:14 PM   #56
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I didn't realize there was that big of a difference in the auto and manual but that center pipe and sound were the reasons I switched to MBRPs.
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