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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 |
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.
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FWIW Dundon also makes a catted version.
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Originally Posted by flsupraguy
(Post 15599585)
FWIW Dundon also makes a catted version.
I think they are more available now than a year ago. |
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.
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Originally Posted by bergx7
(Post 15599628)
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.
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Originally Posted by flsupraguy
(Post 15599651)
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.
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. |
Originally Posted by flsupraguy
(Post 15599651)
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.
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... |
Originally Posted by Jamie@dundonmotorsports
(Post 15601291)
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... https://memesbams.com/wp-content/upl...-More-Meme.jpg |
Do the 997.1 catted headers fit onto other aftermarket exhausts ? Aka sharkwerks track exhaust with side muffler delete ?
Intake runners..... Most excellent |
Originally Posted by Tcomegna
(Post 15601380)
Do the 997.1 catted headers fit onto other aftermarket exhausts ? Aka sharkwerks track exhaust with side muffler delete ?
Intake runners..... Most excellent 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. |
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 |
Do it. https://cimg6.ibsrv.net/gimg/rennlis...324ac0c7f.jpeg
Originally Posted by yoojeankim
(Post 15599271)
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 |
Originally Posted by Tcomegna
(Post 15602372)
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 http://sharkwerks.com/products.php?pid=153 Dont do it though, it will be loud and drone when mixed with long tubes. |
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