Rennlist - Porsche Discussion Forums

Notices
997 GT2/GT3 Forum 2005-2012
Sponsored by:
Sponsored by: Porsche North Houston

Dundon headers? Cobb?

Thread Tools
 
Search this Thread
 
Old 01-28-2019, 07:01 PM
  #1  
yoojeankim
Instructor
Thread Starter
 
yoojeankim's Avatar
 
Join Date: Feb 2016
Location: Denver, CO
Posts: 169
Received 46 Likes on 14 Posts
Default Dundon headers? Cobb?
Had a 991.1 GT3RS with dundon headers and felt the improvement. I haven't seen many 997 owners with dundon header posts. Wondering who has them and their thoughts? Also dundon+cobb combo

thanks
yoojeankim is offline  
Reply Like
Old 01-28-2019, 07:24 PM
  #2  
adi_d
Racer
 
adi_d's Avatar
 
Join Date: Jan 2016
Location: SF Bay Area
Posts: 296
Likes: 0
Received 57 Likes on 38 Posts
Default
I had the Dundon race headers on my 997.2 for a little while. The 997 engine is not nearly as clean as 991, so the cat-less design was brutal for me (the Whole house would smell of gasoline for a day or so after driving); but that is not a Dundon issue, just the nature of forgoing cats. Fit and finish was great and sound was great, but far too loud for our local tracks (I would guess 113DB+). Improvement in power and delivery was definitely noticeable. Jamie was great to deal with as well.
adi_d is offline  
Reply Like
Old 01-28-2019, 09:00 PM
  #3  
flsupraguy
Rennlist Member
 
flsupraguy's Avatar
 
Join Date: Jul 2012
Posts: 3,814
Received 1,513 Likes on 816 Posts
Default
FWIW Dundon also makes a catted version.
flsupraguy is offline  
Reply Like
Old 01-28-2019, 09:02 PM
  #4  
adi_d
Racer
 
adi_d's Avatar
 
Join Date: Jan 2016
Location: SF Bay Area
Posts: 296
Likes: 0
Received 57 Likes on 38 Posts
Default
Originally Posted by flsupraguy
FWIW Dundon also makes a catted version.
They do in theory, but I would inquire with Jamie about availability first

I think they are more available now than a year ago.
Last edited by adi_d; 01-28-2019 at 11:34 PM.
adi_d is offline  
Reply Like
Old 01-28-2019, 09:18 PM
  #5  
bergx7
Rennlist Member
 
bergx7's Avatar
 
Join Date: Mar 2011
Posts: 524
Received 139 Likes on 62 Posts
Default
I have Dundon catted setup. I like it, no smell issues for me, though my car has a "few" other mods (4.0 engine...) so hard to give you a perspective on power increase from them. I will note that their design is markedly different than the geometry of a lot of other systems on the market and I think quite close to a full race setup from that standpoint. It is a PITA to get it perfectly installed/aligned but all the Goldcrest guys were giving the design a thumbs up.
Last edited by bergx7; 01-28-2019 at 09:35 PM.
bergx7 is offline  
Reply Like
Old 01-28-2019, 09:28 PM
  #6  
flsupraguy
Rennlist Member
 
flsupraguy's Avatar
 
Join Date: Jul 2012
Posts: 3,814
Received 1,513 Likes on 816 Posts
Default
Originally Posted by bergx7
I have Dundon catted setup. I like it, no smell issues for me, though my car has a "few" other mods (4.0 engine...) so hard to give you a perspective on power increase from them.
Maybe Jamie can chime in and elaborate on power differences between catted and non catted. I plan to track a decent amount so no catted likely will suit me best.
flsupraguy is offline  
Reply Like
Old 01-28-2019, 09:39 PM
  #7  
bergx7
Rennlist Member
 
bergx7's Avatar
 
Join Date: Mar 2011
Posts: 524
Received 139 Likes on 62 Posts
Default
Originally Posted by flsupraguy
Maybe Jamie can chime in and elaborate on power differences between catted and non catted. I plan to track a decent amount so no catted likely will suit me best.
He can also sell you a test pipe that bolts right in, so my setup can flip to catless for the price of the test pipe if needed.

My engine destroyed the set of GMG headers / cats I had on there previously (some decent track time) so time will tell how long these last.
bergx7 is offline  
Reply Like

Trending Topics

Old 01-29-2019, 03:23 PM
  #8  
Jamie@dundonmotorsports
Basic Sponsor
Rennlist
Site Sponsor
 
Jamie@dundonmotorsports's Avatar
 
Join Date: Jan 2016
Location: Gig Harbor, Wa
Posts: 1,955
Received 371 Likes on 205 Posts
Default
Originally Posted by flsupraguy
Maybe Jamie can chime in and elaborate on power differences between catted and non catted. I plan to track a decent amount so no catted likely will suit me best.
Hapy to help (sometimes it’s better to email... )

Catted and Race are similar gains on the
997.1 GT3 race is about 20whp, catted is about 18-20
997.2GT3 race is about 20-22whp catted is about 20whp
997.2RS race is about 25-28whp, catted is about 22-25whp
torque gains are all about the same up to peak torque.

important things are to ensure the airbox is pulling in cold outside air, and to go after the next inefficiencies, airbox, intake manifold are big ones.

intake runners are coming out end of the quarter or so for the 997 GT3’s...
Jamie@dundonmotorsports is offline  
Reply Like
Old 01-29-2019, 03:33 PM
  #9  
flsupraguy
Rennlist Member
 
flsupraguy's Avatar
 
Join Date: Jul 2012
Posts: 3,814
Received 1,513 Likes on 816 Posts
Default
Originally Posted by Jamie@dundonmotorsports


Hapy to help (sometimes it’s better to email... )

Catted and Race are similar gains on the
997.1 GT3 race is about 20whp, catted is about 18-20
997.2GT3 race is about 20-22whp catted is about 20whp
997.2RS race is about 25-28whp, catted is about 22-25whp
torque gains are all about the same up to peak torque.

important things are to ensure the airbox is pulling in cold outside air, and to go after the next inefficiencies, airbox, intake manifold are big ones.

intake runners are coming out end of the quarter or so for the 997 GT3’s...
Intake Runners
flsupraguy is offline  
Reply Like
Old 01-29-2019, 03:56 PM
  #10  
Tcomegna
Instructor
 
Tcomegna's Avatar
 
Join Date: Mar 2013
Posts: 218
Likes: 0
Received 58 Likes on 25 Posts
Default
Do the 997.1 catted headers fit onto other aftermarket exhausts ? Aka sharkwerks track exhaust with side muffler delete ?

Intake runners..... Most excellent
Tcomegna is offline  
Reply Like
Old 01-29-2019, 04:24 PM
  #11  
flsupraguy
Rennlist Member
 
flsupraguy's Avatar
 
Join Date: Jul 2012
Posts: 3,814
Received 1,513 Likes on 816 Posts
Default
Originally Posted by Tcomegna
Do the 997.1 catted headers fit onto other aftermarket exhausts ? Aka sharkwerks track exhaust with side muffler delete ?

Intake runners..... Most excellent
The Dundon catted and non catted headers will fit the oem center, dundons center, and any center delete thats made to replace the oem center.

However, with the Dundons you lose the side mufflers since their exhaust extends past where the side mufflers were.

A center delete matched with Dundons headers will be LOUD and drone.
flsupraguy is offline  
Reply Like
Old 01-29-2019, 10:44 PM
  #12  
Tcomegna
Instructor
 
Tcomegna's Avatar
 
Join Date: Mar 2013
Posts: 218
Likes: 0
Received 58 Likes on 25 Posts
Default
https://rennlist.com/forums/parts-ma...97-gt3-rs.html

So even this sharkwerks that replaces the oem centre would fit ?!

Mine is a side muffler delete system not this centre muffler delete.

Thanks for the help guys
Tcomegna is offline  
Reply Like
Old 01-29-2019, 11:54 PM
  #13  
FJSeattle
Pro
 
FJSeattle's Avatar
 
Join Date: Aug 2014
Location: Seattle, WA
Posts: 533
Likes: 0
Received 9 Likes on 8 Posts
Default
Do it.

Originally Posted by yoojeankim
Had a 991.1 GT3RS with dundon headers and felt the improvement. I haven't seen many 997 owners with dundon header posts. Wondering who has them and their thoughts? Also dundon+cobb combo

thanks
FJSeattle is offline  
Reply Like
Old 01-29-2019, 11:56 PM
  #14  
flsupraguy
Rennlist Member
 
flsupraguy's Avatar
 
Join Date: Jul 2012
Posts: 3,814
Received 1,513 Likes on 816 Posts
Default
Originally Posted by Tcomegna
https://rennlist.com/forums/parts-ma...97-gt3-rs.html

So even this sharkwerks that replaces the oem centre would fit ?!

Mine is a side muffler delete system not this centre muffler delete.

Thanks for the help guys
No, that one wouldnt fit. The standard center muffler delete would though.

http://sharkwerks.com/products.php?pid=153

Dont do it though, it will be loud and drone when mixed with long tubes.
flsupraguy is offline  
Reply Like
Back to Subforum
997 GT2/GT3 Forum
View Next Unread
WTS Lots of Leather Stuff $$$




Advanced Search
Quick Reply: Dundon headers? Cobb?


Reply Closed Thread Share
Forum Jump

All times are GMT -3. The time now is 07:18 AM.