40whp and 30wtq gains with Dundon Motorsports Headers, no flash required! - Page 22 - Rennlist - Porsche Discussion Forums

Go Back  Rennlist - Porsche Discussion Forums > Water Cooled Technical Discussion Areas > 991 GT3 GT3RS and 911R
Reload this Page > 40whp and 30wtq gains with Dundon Motorsports Headers, no flash required!
991 GT3 GT3RS and 911R
Sponsored by:

40whp and 30wtq gains with Dundon Motorsports Headers, no flash required!

Reply

Old 01-12-2018, 10:52 PM
  #316  
Obsessed Garage
Basic Sponsor
Rennlist
Site Sponsor

 
Obsessed Garage's Avatar
 
Join Date: Aug 2013
Posts: 3,653
Default

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.
__________________
Garage Design / Personally Selected Car Care / Obsessed Apparel / Wealth Management

ObsessedGarage.com / ObsessedGarageStore.com
YouTube Channel / Dialed In Podcast / Instagram / Facebook

ObsessedWealth.com
Facebook

'16 GT3 RS - '08 S2000 CR - '13 Gen 1 Raptor - '18 Gen 2 Raptor
Check Out My GT3 RS Journal / Join OG Facebook Group
Obsessed Garage is offline  
Reply With Quote
Old 01-12-2018, 10:56 PM
  #317  
Psup4s
Addict
Rennlist Member
 
Psup4s's Avatar
 
Join Date: Dec 2013
Location: Here
Posts: 726
Default

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
Psup4s is offline  
Reply With Quote
Old 01-12-2018, 11:04 PM
  #318  
Obsessed Garage
Basic Sponsor
Rennlist
Site Sponsor

 
Obsessed Garage's Avatar
 
Join Date: Aug 2013
Posts: 3,653
Default

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.
__________________
Garage Design / Personally Selected Car Care / Obsessed Apparel / Wealth Management

ObsessedGarage.com / ObsessedGarageStore.com
YouTube Channel / Dialed In Podcast / Instagram / Facebook

ObsessedWealth.com
Facebook

'16 GT3 RS - '08 S2000 CR - '13 Gen 1 Raptor - '18 Gen 2 Raptor
Check Out My GT3 RS Journal / Join OG Facebook Group
Obsessed Garage is offline  
Reply With Quote
Old 01-13-2018, 05:23 AM
  #319  
drdonger
Addict
Rennlist Member
 
drdonger's Avatar
 
Join Date: Feb 2015
Location: Dallas, TX
Posts: 1,354
Default

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.
drdonger is offline  
Reply With Quote
Old 01-13-2018, 01:55 PM
  #320  
Alan C.
Addict
Rennlist Member
 
Alan C.'s Avatar
 
Join Date: Jun 2001
Location: Ohio
Posts: 7,267
Default

Having followed Matt for a few miles in the Smokies the Dundon headers sound great and the car pulls hard out of the corners.
Alan C. is offline  
Reply With Quote
Old 01-13-2018, 02:36 PM
  #321  
[email protected]
Basic Sponsor
Rennlist
Site Sponsor

Thread Starter
 
Jamie@dundonmotorsports's Avatar
 
Join Date: Jan 2016
Posts: 1,203
Default

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 donít 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...
Jamie@dundonmotorsports is offline  
Reply With Quote
Old 01-13-2018, 02:37 PM
  #322  
[email protected]
Basic Sponsor
Rennlist
Site Sponsor

Thread Starter
 
Jamie@dundonmotorsports's Avatar
 
Join Date: Jan 2016
Posts: 1,203
Default

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!
Jamie@dundonmotorsports is offline  
Reply With Quote
Old 01-13-2018, 03:15 PM
  #323  
AhsanU
User
 
AhsanU's Avatar
 
Join Date: Nov 2017
Location: NYC
Posts: 59
Default

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.
AhsanU is offline  
Reply With Quote
Old 01-13-2018, 05:31 PM
  #324  
[email protected]
Basic Sponsor
Rennlist
Site Sponsor

Thread Starter
 
Jamie@dundonmotorsports's Avatar
 
Join Date: Jan 2016
Posts: 1,203
Default

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
__________________
Dundon Motorsports
Gig Harbor, WA
253-200-4454
[email protected]

www.dundonmotorsports.com
Facebook.com/dundonmotorsports
Instagram @dundon_motorsports
Jamie@dundonmotorsports is offline  
Reply With Quote
Old 01-14-2018, 04:53 AM
  #325  
LSs1Power
User
 
LSs1Power's Avatar
 
Join Date: Oct 2002
Posts: 286
Default

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.
LSs1Power is offline  
Reply With Quote
Old 01-14-2018, 12:28 PM
  #326  
drdonger
Addict
Rennlist Member
 
drdonger's Avatar
 
Join Date: Feb 2015
Location: Dallas, TX
Posts: 1,354
Default

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 donít 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.
drdonger is offline  
Reply With Quote
Old 01-15-2018, 02:54 PM
  #327  
[email protected]
Basic Sponsor
Rennlist
Site Sponsor

Thread Starter
 
Jamie@dundonmotorsports's Avatar
 
Join Date: Jan 2016
Posts: 1,203
Default

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 canít 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
__________________
Dundon Motorsports
Gig Harbor, WA
253-200-4454
[email protected]

www.dundonmotorsports.com
Facebook.com/dundonmotorsports
Instagram @dundon_motorsports
Jamie@dundonmotorsports is offline  
Reply With Quote
Old 02-01-2018, 08:02 AM
  #328  
Asco
Addict
Rennlist Member
 
Join Date: Mar 2016
Location: Malaysia
Posts: 345
Default

Hey guys, any updates on the lifetime muffler? Would really like to know the sound levels with the street headers (with and without cats) and lifetime muffler.
My RS was measured at 1000rpm - 87 dB, 3000-4000rpm - 107dB and under load went up to 130dB. Street headers with test pipes and stock center muffler. Measurements done at 45 degrees 0.5meters away. Muffler inspected - no cracks.
Limit for the Ring seems to be 120dB, would be good to pass that.
Thanks for the reply in advance!
Asco is offline  
Reply With Quote
Old 02-01-2018, 03:58 PM
  #329  
[email protected]
Basic Sponsor
Rennlist
Site Sponsor

Thread Starter
 
Jamie@dundonmotorsports's Avatar
 
Join Date: Jan 2016
Posts: 1,203
Default

Originally Posted by Asco View Post
Hey guys, any updates on the lifetime muffler? Would really like to know the sound levels with the street headers (with and without cats) and lifetime muffler.
My RS was measured at 1000rpm - 87 dB, 3000-4000rpm - 107dB and under load went up to 130dB. Street headers with test pipes and stock center muffler. Measurements done at 45 degrees 0.5meters away. Muffler inspected - no cracks.
Limit for the Ring seems to be 120dB, would be good to pass that.
Thanks for the reply in advance!

The Quiet muffler reduces dB by about 10-12dB in our testing, cats reduce sound by 4-5dB over our race system. So a Catted system with the cats in with Quiet Muffler should get you where you need to be! We're shipping mufflers now!
__________________
Dundon Motorsports
Gig Harbor, WA
253-200-4454
[email protected]

www.dundonmotorsports.com
Facebook.com/dundonmotorsports
Instagram @dundon_motorsports
Jamie@dundonmotorsports is offline  
Reply With Quote

Thread Tools
Search this Thread

Contact Us Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: