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Dynomax 17676 Muffler Install

I recently installed a Dynomax 17676 muffler, and have to say, it is very well suited to the Porsche 911. While it is noisy, and does seem to emphasize the poorly designed, unequal-length exhaust system on the catted 3.2, it sounds very raspy and aggressive. It also fits very snuggly inside the bumper cavity and is easily half the size of the factory sausage.

Installation involved welding and cutting, obviously, but wasn't difficult. It seems the 2.5" ID of the Dynomax muffler is a hair under 2.5", and this made it difficult to fit my choice Vibrant exhaust pipe. To fix this, I found some poorly tolleranced Pep-Boys exhaust tubing reducers which fit nicely inside the muffler. Unfortunately, this metal is very bad, and this made welding very difficult. Should I ever need to do it again, I will likely just cut relief slots in the muffler's inlet and outlet pipes to better fit the Vibrant (or similar) exhaust pipe.

There is no outlet/inlet on the 17676, at least I don't think there is. Either end can be used as an inlet. It seems very symmetrical internally. Fitment involved, for me, a quick 6mm hole drilled in the stock muffler's clamp bracket thing in the heater tube and a tab welded to the muffler. While many will claim I've "ruined" something irreplaceable, I feel it was a necessary sacrifice, as it allows for a very secure mounting position that holds my muffler against gravity very effectively.

I found the standard, Pep-Boys-supplied Vibrant 2.5" 3-bolt exhaust flange to be nearly-exactly the 2.9" required bolt spacing. It fit nicely, but does require some fine tuning when tightening the bolts from the cat bypass to the muffler. It wouldn't take much to severely misalign the tubing.

All that said, without the beer breaks and the time spent measuring, cutting, and welding away from the car (no extension on the welder to weld on the lift), I'd say it took me about 3 hours of work, minus the flat black paint.

My mistakes: I definitely didn't cut very effectively. The tailpipe, specifically, was not cut tangentially and has an edginess to it that could be avoided. While I'm sure the muffler offers much more restriction than this mistake, it bugs me to look at it. I also cut the tailpipe a bit too short, and it heats up my bumper. I'll add a tip later. Finally, I didn't take into consideration the stretching from welding, and all my nice measurements went out the window as I was assembling. I had to call a couple audibles to make up the difference, and as a result, the muffler sits dangerously close to the inside of the bumper. As mentioned, avoid use of poor-quality exhaust components like the Pep-Boys reducers. The don't weld like the rest of the exhaust components and are difficult to deal with. I made a few holes and had to fill with some bird poopoo welds. Oh well, only I know they're there!

It is hard to say exactly how loud the system is. A friend who helped me hold things in place for installation has a 2016 Mustang GT with an MBRP cat-back and stock cats. While revving in a parking lot, his exhaust is still slightly louder than my cat-less Dynomax 17676 system, for reference. I would say full throttle, full load, my car is probably a bit louder than his, thanks to a catalytic converter missing.

Here is a photo of my completed muffler and a stationary video (all the way at the bottom of post) at the shop. Enjoy.



https://youtu.be/w7sm_9AEwnE


Last edited by MBellRacing; 06-27-2017 at 10:16 PM..
Old 06-27-2017, 10:13 PM
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I love it! I've been wanting to a 1-chamber Flowmaster on my turbo'd 3.2, so happy to see other's experimenting and their results as yours.

I wouldn't sweat the tailpipe, I didn't even notice until you pointed it out, and even then....

Sounds pretty good.

My favorite I've heard is the M&K muffler. It's perfect.
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Old 06-28-2017, 04:22 AM
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Looks nice to me! Which grade wire did you weld with, please?
Old 06-28-2017, 09:10 AM
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Thanks, guys! I'm not sure on the grade of wire. It's been in the MIG for about a year now at my dad's shop. It's probably reasonably good stuff. My big issue with the welding, as mentioned, is that the Pep-Boys reducers took a lot of heat and low feed, the muffler liked low heat, more feed. Finding a happy setting and moving appropriately fast was difficult.

I'm out racing the next couple weeks, but once I'm back, I'll make sure to take some video of the car driving and maybe even a dB test from 50' compared to a few other cars. It sounds way louder with he window down while driving than it seems standing right behind he car, which is weird! Overall, very happy with it!
Old 06-28-2017, 09:39 AM
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Yep the 17676 muffler is a universal muffler and has no direction of flow. The inlet/outlet location you choose doesn't matter.

I had this muffler on my '87 with a Fabspeed cat bypass/premuffler and I really liked how it sounded. A bit grumbly at low rpms but not unruly at all. At high rpms it rips nicely. Here it is on a friend's car

https://www.youtube.com/watch?v=-1X2b9Ahx9A
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Old 06-28-2017, 09:51 AM
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Ah OK, I thought the muffler was stainless and wondered if you used stainless welding wire also - I now see that it is aluminized steel.
Old 06-28-2017, 11:16 AM
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I recently installed one of these on my stock 82 SC and it sounds awesome! The only thing on my wishlist is aesthetic: I’d love to have GT3 style dual center exhaust tips. Any idea what the best way to go about that would be? Or perhaps another muffler that sounds the same but would be a better fit for dual center tips?
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Old 09-03-2019, 06:58 PM
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I think there is a motor for sale right now that has a dual center exhaust tips welded into a 17676 (or similar). Might want to PM the seller.
Old 09-03-2019, 11:46 PM
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Quote:
Originally Posted by tdw28210 View Post
I think there is a motor for sale right now that has a dual center exhaust tips welded into a 17676 (or similar). Might want to PM the seller.
I wasn't able to find the engine you referenced. Any chance you can point me to the post?
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Old 09-08-2019, 12:43 PM
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I used this on my Carrera, and have the tailpipe coming through the rear bumper with a carbon fiber tip. Have some videos of it as well.
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Old 09-08-2019, 01:05 PM
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I built mine like the B&B unit except used the bottom as the inlet to simplify. The single U-bend worked out to be a perfect side exit. Cost me $105 in 2013. Packing in the muffler has started to get a little tired and it's a bit louder than when new, but the price was right.

Here's the Summit parts list I used:
SUM-622003 2.5" U-bend pipe - $21.95
WLK-17676 Walker 1 in 1 out same side - $69.95
WLK-31900 Walker 2.5" 3-bolt flange - $3.95



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Old 09-09-2019, 05:28 AM
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Thanks for this!

Quote:
Originally Posted by Driven97 View Post
I built mine like the B&B unit except used the bottom as the inlet to simplify. The single U-bend worked out to be a perfect side exit. Cost me $105 in 2013. Packing in the muffler has started to get a little tired and it's a bit louder than when new, but the price was right.

Here's the Summit parts list I used:
SUM-622003 2.5" U-bend pipe - $21.95
WLK-17676 Walker 1 in 1 out same side - $69.95
WLK-31900 Walker 2.5" 3-bolt flange - $3.95



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Old 09-09-2019, 06:03 AM
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Quote:
Originally Posted by Driven97 View Post
I built mine like the B&B unit except used the bottom as the inlet to simplify. The single U-bend worked out to be a perfect side exit. Cost me $105 in 2013. Packing in the muffler has started to get a little tired and it's a bit louder than when new, but the price was right.

Here's the Summit parts list I used:
SUM-622003 2.5" U-bend pipe - $21.95
WLK-17676 Walker 1 in 1 out same side - $69.95
WLK-31900 Walker 2.5" 3-bolt flange - $3.95



I feel like I got this idea from you way back in 2014.

Then I shared it with Gretz while in LA for Luft6

Quote:
Quote:
Originally Posted by Gretz View Post
I bought a Dynomax 17676 muffler off Amazon for about $75 and took it to a local exhaust shop. They custom made the pipe to connect it to my cat delete test pipe and also welded on a tailpipe. They did great work and only charged me $100. So total cost is under $200.

The sound is exactly what youíre describing. I got turned onto this solution in LA a few months back at Luft. I heard a car up at Newcombís Ranch that sounded fantastic. The owner of the car told me that he just had this inexpensive Dynomax muffler. I totally realize itís not a top quality part like the M&K exhaust but itís a fraction of the price and gives me exactly the sound I was looking for.
That was me! I've been running that muffler for five years this week. It just gets better with age!



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Old 10-04-2019, 07:29 PM
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Sounds so good! In fact Iím taking my M&K off tomorrow and reinstalling this, despite the far superior workmanship and appearance of the M&K. Now if only I could figure out how to get dual center tailpipes with this setup...
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Old 10-04-2019, 08:27 PM
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Also I painted it black and should look much better on the car. Sorry for the typical iPhone picture rotation!


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Old 10-04-2019, 08:30 PM
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