Best Exhaust for a 991.2 GT3 - Page 16 - Rennlist - Porsche Discussion Forums

991 GT3 GT3RS and 911R
Sponsored by:

Best Exhaust for a 991.2 GT3


Old 01-14-2018, 02:09 AM
  #226  
drdonger
Addict
Rennlist Member
 
drdonger's Avatar
 
Join Date: Feb 2015
Location: Dallas, TX
Posts: 1,350
Default

Originally Posted by [email protected] View Post
Hi Doug, unless you're going to add an electronic intercept of some sort and control the valves outside of the factory system, they will close between 2000-3000 rpm regardless of the state of the button (open or closed). This is due to the factory ensuring the valves are closed to prevent issues with drone.

There are electronic intercepts available, but quite honestly we like the factory implementation of the valves, they open with increasing load on the engine to keep the engine safe and performance optimized and close where there would be annoying drone (highway cruising etc...)

If you're looking for more volume, more power and less weight our 991 Street Header systems with valved side deletes is a great way to go. The Race system is even better...

Jamie
Do you make valveless side pipe replacements to go with your race headers?
drdonger is offline  
Reply With Quote
Old 01-14-2018, 02:20 AM
  #227  
BrntRubber
User
Thread Starter
 
BrntRubber's Avatar
 
Join Date: Apr 2017
Posts: 512
Default

Originally Posted by Jimmy-D View Post
I received mine the other day and I have to say they look fantastic. This is not my first Bypass but very impressed by how light but also how large the tubes are. It is an interesting design and one needs to see them in person. I am anxious to put them on next week. I also like the size of the tips. They are 4 inches wide( left to right, per se) and 4.5 inches North to South- this I like very much and with the extended tips they are going to stand/stick out- sort to speak.
looking forward to some vids and first impressions when installed Jimmy
BrntRubber is online now  
Reply With Quote
Old 01-14-2018, 08:44 AM
  #228  
GT3
Addict
Rennlist Member
 
GT3's Avatar
 
Join Date: Jun 2009
Location: FL
Posts: 891
Default

I’m leaning towards doing Akrapovic race system again. It was great on my 997.2 GT3. But I’m gonna do more homework on Dundon and IPE to compare.
GT3 is offline  
Reply With Quote
Old 01-14-2018, 11:09 AM
  #229  
Apex-Monkey
Addict
Rennlist Member
 
Join Date: Jul 2017
Location: Houston, Texas
Posts: 31
Default

Originally Posted by GT3 View Post
Iím leaning towards doing Akrapovic race system again. It was great on my 997.2 GT3. But Iím gonna do more homework on Dundon and IPE to compare.
I have akrapovic on my rs7, it brings me a smile even on the worst days. They have become my favorite aftermarket company for exhaust for various reason (quality of build, sound etc..), "pricing" is the only real downside to the product, but you get what you pay for.
Apex-Monkey is online now  
Reply With Quote
Old 01-14-2018, 11:33 AM
  #230  
Jimmy-D
Super User
 
Jimmy-D's Avatar
 
Join Date: Mar 2014
Location: Midwest
Posts: 8,125
Default

Originally Posted by GT3 View Post
I’m leaning towards doing Akrapovic race system again. It was great on my 997.2 GT3. But I’m gonna do more homework on Dundon and IPE to compare.
Three very different choices and I have no skin in the game because I am fine just with a Bypass. I am not looking for Performance but just a louder tune with more bass. But on my GT4 I Modded the heck out of it so I understand the process one goes thru to get to their decision

The following are my thoughts:

- The Akra very expensive and if paying that much I would want to confirm I am getting the performance for the price. It certainly looks pretty but you will never see it but if you really like that titanium sound and money, no object, then I guess this makes sense

- If you want Performance Dundon, and many Owners, have proved that you get the Performace you pay for. I would have to hear both the Akra and Dundon, live, to determine which sound better because no video will express that.

-IPE- No comment. I would need to do my due diligence and see all the data.

******One thing which would also be a huge consideration would also be Customer Service if any issues arise ect..

Of your three choices I would probably arrive at Dundon and I have never purchased any of their products. But that is not to say I wouldn't in the future
Jimmy-D is online now  
Reply With Quote
Old 01-14-2018, 01:08 PM
  #231  
Dougr743
User
 
Join Date: Dec 2015
Posts: 141
Default

I like the stock center muffler, and live in SC , no inspection, so I an run the Catless headers. I am most concerned with warranty and throwing codes. IF the code issue is moot, and it will not through codes, dont have to also do a tune (obsessed said something about not having to due a tune for his RS) and It is cool with my dealer for warranty, I am getting headers.
Dougr743 is offline  
Reply With Quote
Old 01-14-2018, 01:27 PM
  #232  
GRPerformance
Basic Sponsor
Rennlist
Site Sponsor

 
GRPerformance's Avatar
 
Join Date: Oct 2017
Location: Brownsburg, IN
Posts: 114
Default

Originally Posted by GT3 View Post
Iím leaning towards doing Akrapovic race system again. It was great on my 997.2 GT3. But Iím gonna do more homework on Dundon and IPE to compare.
We are akra dealers. If you want a quote from us feel free to let me know!
GRPerformance is offline  
Reply With Quote
Old 01-14-2018, 01:28 PM
  #233  
GRPerformance
Basic Sponsor
Rennlist
Site Sponsor

 
GRPerformance's Avatar
 
Join Date: Oct 2017
Location: Brownsburg, IN
Posts: 114
Default

Originally Posted by Dougr743 View Post
I like the stock center muffler, and live in SC , no inspection, so I an run the Catless headers. I am most concerned with warranty and throwing codes. IF the code issue is moot, and it will not through codes, dont have to also do a tune (obsessed said something about not having to due a tune for his RS) and It is cool with my dealer for warranty, I am getting headers.
From my understanding, catless will throw codes without a tune.
GRPerformance is offline  
Reply With Quote
Old 01-14-2018, 01:51 PM
  #234  
drdonger
Addict
Rennlist Member
 
drdonger's Avatar
 
Join Date: Feb 2015
Location: Dallas, TX
Posts: 1,350
Default

Originally Posted by GRPerformance View Post


From my understanding, catless will throw codes without a tune.
Dundon does not throw a cel.
drdonger is offline  
Reply With Quote
Old 01-14-2018, 01:55 PM
  #235  
1Gunner
Addict
Rennlist Member
 
1Gunner's Avatar
 
Join Date: Sep 2002
Location: In a van down by the Ottawa River ...
Posts: 3,169
Default

Originally Posted by drdonger View Post


Dundon does not throw a cel.
Without cats it must come with a tune or some other electronic fix to eliminate CELs.
1Gunner is online now  
Reply With Quote
Old 01-14-2018, 01:55 PM
  #236  
drdonger
Addict
Rennlist Member
 
drdonger's Avatar
 
Join Date: Feb 2015
Location: Dallas, TX
Posts: 1,350
Default

I think I may go with dundon race headers with a custom pipe connecting it to an ipe catback. Have IPE sound with Dundon performance. Best of both worlds.
drdonger is offline  
Reply With Quote
Old 01-14-2018, 01:56 PM
  #237  
drdonger
Addict
Rennlist Member
 
drdonger's Avatar
 
Join Date: Feb 2015
Location: Dallas, TX
Posts: 1,350
Default

Originally Posted by 1Gunner View Post
Without cats it must come with a tune or some other electronic fix to eliminate CELs.
Wrong. Dundon has o2 dongles that the oem sensors plug into.
drdonger is offline  
Reply With Quote
Old 01-14-2018, 02:03 PM
  #238  
RS911
Addict
Rennlist Member
 
RS911's Avatar
 
Join Date: Aug 2015
Location: La Jolla
Posts: 137
Default

I too have been looking at the Akrapovic or the Dundon systems. One concern I have is, if these exhaust systems will pass the California smog (emission compliance).
RS911 is offline  
Reply With Quote
Old 01-14-2018, 02:04 PM
  #239  
James-GMG
Basic Sponsor
Rennlist
Site Sponsor

 
James-GMG's Avatar
 
Join Date: Nov 2008
Posts: 1,686
Default

Wow, so much information to take in, this is great for the consumer.
Thanks to those who chose GMG as their exhaust of choice as we have been shipping them out the last few weeks as many of you have timed our shipments with your car deliveries.
We have been making this version for the GT3 since 2007 and it's by far one of the best upgrades for the car to really extract that proper sound the car can make when "unmuffled", while still utilizing the Sport Button.





__________________

James F. Sofronas | President & Owner
Global Motorsports Group ô
E: [email protected]
P: +1 (714) 432-1582
F: +1 (714) 432-1590
A: 3210 South Shannon Street, Santa Ana, California 92704
W: gmgracing.com

Last edited by James-GMG; 01-14-2018 at 04:41 PM.
James-GMG is offline  
Reply With Quote
Old 01-14-2018, 02:22 PM
  #240  
Alan C.
Addict
Rennlist Member
 
Alan C.'s Avatar
 
Join Date: Jun 2001
Location: Ohio
Posts: 7,264
Default

Originally Posted by drdonger View Post
Wrong. Dundon has o2 dongles that the oem sensors plug into.
I've had Dundon headers on my GT4 for a year and no CELs.
Alan C. is online now  
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: