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991 GT3 GT3RS and 911R
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40whp and 30wtq gains with Dundon Motorsports Headers, no flash required!

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Old 01-12-2018, 11:52 PM
  #316
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Originally Posted by drdonger View Post



Is there a purpose for the valved portion of the race headers? Can the valve be eliminated or can it be purchased with valveless side pipes? I am contemplating cutting the side pipe where the red line is after the 02 sensors to fit a different exhaust that only has a one pipe opening. Thanks
I'm pretty sure Jaime will chime in, but I'm pretty sure they can make non-valved version. They had offered it originally, but I think most people ordered valved.
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Old 01-12-2018, 11:56 PM
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Originally Posted by Obsessed Garage View Post
100% Real. I didn't know these guys from Adam when I took a flyer on one of their first sets. This was my 13th exhaust variant on my car. It was the last. Going on my RS as well.

https://rennlist.com/forums/991-gt3-...s-exhaust.html
Thanks Matt, coming from you I know I will def be looking into it
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Old 01-13-2018, 12:04 AM
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Originally Posted by Psup4s View Post
Thanks Matt, coming from you I know I will def be looking into it
As long as you can swing the cost for custom made 321SS, it's amazing. I'm just waiting on the new center section to put it on the RS.
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Old 01-13-2018, 06:23 AM
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Originally Posted by Obsessed Garage View Post
I'm pretty sure Jaime will chime in, but I'm pretty sure they can make non-valved version. They had offered it originally, but I think most people ordered valved.
Thanks Matt.
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Old 01-13-2018, 02:55 PM
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Having followed Matt for a few miles in the Smokies the Dundon headers sound great and the car pulls hard out of the corners.
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Old 01-13-2018, 03:36 PM
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Originally Posted by drdonger View Post




Is there a purpose for the valved portion of the race headers? Can the valve be eliminated or can it be purchased with valveless side pipes? I am contemplating cutting the side pipe where the red line is after the 02 sensors to fit a different exhaust that only has a one pipe opening. Thanks
Hi, yes there is a purpose for the valved portion of the race headers. The valve directs the exhaust flow to the upper chamber of the center muffler, this eliminates drone between 2200-3000rpm, as the factory intended.

if you don’t drive on the street, we can absolutely make a set of race headers without valves for you.

Contact me directly for pricing and ETA as we will have to custom make them.

i would also recommend our lifetime center muffler for track use as the lack of side mufflers combined with track use is too much for the stock center muffler to take and it will crack...
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Old 01-13-2018, 03:37 PM
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Originally Posted by Psup4s View Post
Thanks Matt, coming from you I know I will def be looking into it
let me know if we can answer any questions for you!
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Old 01-13-2018, 04:15 PM
  #323
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Itching for these headers so badly.

Jamie, is it possible to purchase the headers without Dundon's side mufflers? As in, I'm interested in running catless, but I also would like to use AWE's switchpath exhaust, which replaces the side mufflers and the center muffler but keeps the ability to close valves for no drone while having the raucous sound of a center muffler bypass. I would hope this doesn't affect the ability to cause no CEL's to occur. Please educate me!

Thanks.
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Old 01-13-2018, 06:31 PM
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Originally Posted by AhsanU View Post
Itching for these headers so badly.

Jamie, is it possible to purchase the headers without Dundon's side mufflers? As in, I'm interested in running catless, but I also would like to use AWE's switchpath exhaust, which replaces the side mufflers and the center muffler but keeps the ability to close valves for no drone while having the raucous sound of a center muffler bypass. I would hope this doesn't affect the ability to cause no CEL's to occur. Please educate me!

Thanks.
Hi Ahsan,

Our headers are much longer than stock so our side deletes don't work with other exhaust products that attach to the stock header attachment. Our headers will work with the stock center muffler, or any center muffler replacement.

That said the most power is produced by using the stock center muffler or our Llifetime 321SS muffler.

By having the valves in the side muffler deletes you obtain the same result as a switch path exhaust but get to keep the stock muffler (or ours).

Thank you,

Jamie
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Old 01-14-2018, 05:53 AM
  #325
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I want to order the race headers so bad especially after i saw what it did to my friend 991.1 GT3. I can’t imagine what it would do on a 991.2 GT3 in terms of power gains.
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Old 01-14-2018, 01:28 PM
  #326
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Originally Posted by [email protected] View Post


Hi, yes there is a purpose for the valved portion of the race headers. The valve directs the exhaust flow to the upper chamber of the center muffler, this eliminates drone between 2200-3000rpm, as the factory intended.

if you don’t drive on the street, we can absolutely make a set of race headers without valves for you.

Contact me directly for pricing and ETA as we will have to custom make them.

i would also recommend our lifetime center muffler for track use as the lack of side mufflers combined with track use is too much for the stock center muffler to take and it will crack...
Thank you for the info. I will be contacting you in the near future to order.
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Old 01-15-2018, 03:54 PM
  #327
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Originally Posted by LSs1Power View Post
I want to order the race headers so bad especially after i saw what it did to my friend 991.1 GT3. I can’t imagine what it would do on a 991.2 GT3 in terms of power gains.
Let's do it!!

Originally Posted by drdonger View Post


Thank you for the info. I will be contacting you in the near future to order.
You bet! Let us know if you have any other questions!

Jamie
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