Best Exhaust for a 991.2 GT3 - Page 11 - Rennlist - Porsche Discussion Forums

Notices
991 GT3 GT3RS and 911R
Sponsored by:

Best Exhaust for a 991.2 GT3

 
Old 12-05-2017, 03:33 AM
  #151  
BrntRubber
User
Thread Starter
 
BrntRubber's Avatar
 
Join Date: Apr 2017
Posts: 876
Default

BrntRubber is offline  
Old 12-06-2017, 03:53 PM
  #152  
Ducktail
User
 
Ducktail's Avatar
 
Join Date: Jan 2005
Location: SZ, Switzerland
Posts: 67
Default

Took the plunge here as well and went for Dundon Motorsport long tube race headers. Being based in Europe I'm not at all experienced with their products, in fact I'd never heard of them before regularly checking this board. However the positive comments shine through everywhere and especially Matt's advice left me with no choice but going the Dundon route.
My 997 RS was relatively similarly equipped, having Cargraphic headers and 200 cell cats, coupled to a side muffler bypass and stock centre muffler, that sounded awesome and came with a worthwhile weight saving.
On the 991.2 I'm going one further in having the catless long tube headers, might be a bit louder than the 997 RS but given the Dundon setup is valved it seems to offer the best of both worlds. Can't wait to try it out!
Ducktail is offline  
Old 12-06-2017, 04:23 PM
  #153  
Jimmy-D
Super User
 
Jimmy-D's Avatar
 
Join Date: Mar 2014
Location: Midwest
Posts: 8,920
Default

Maybe some one can answer this. What are the side mufflers for???

Is they anything negatively impacted by removing them like so many do??

I ask this because back in 2014; Porsche invited most of the .1 14 Owners to their new Center that had just opened in Atlanta as sort as a courtesy thing for hanging in their while the engines were being replaced. In one of the seminars, they had a GT3 up on a lift and they were reviewing and discussing a bunch of the components of the GT3. I had asked about the putting on a rear bypass and that did not seem to matter much but when mentioned about taking off the side mufflers the guy looked at us like we were nuts. He was trying to explain why they were important but it kind of went over my head
Jimmy-D is offline  
Old 12-06-2017, 10:32 PM
  #154  
[email protected]
Basic Sponsor
Rennlist
Site Sponsor

 
Jamie@dundonmotorsports's Avatar
 
Join Date: Jan 2016
Location: Gig Harbor, Wa
Posts: 1,436
Default

Originally Posted by Ducktail View Post
Took the plunge here as well and went for Dundon Motorsport long tube race headers. Being based in Europe I'm not at all experienced with their products, in fact I'd never heard of them before regularly checking this board. However the positive comments shine through everywhere and especially Matt's advice left me with no choice but going the Dundon route.
My 997 RS was relatively similarly equipped, having Cargraphic headers and 200 cell cats, coupled to a side muffler bypass and stock centre muffler, that sounded awesome and came with a worthwhile weight saving.
On the 991.2 I'm going one further in having the catless long tube headers, might be a bit louder than the 997 RS but given the Dundon setup is valved it seems to offer the best of both worlds. Can't wait to try it out!
Shipping on the 7th! Thanks Ducktail!
__________________
Dundon Motorsports
Gig Harbor, WA
253-200-4454
[email protected]

www.dundonmotorsports.com
Facebook.com/dundonmotorsports
Instagram @dundon_motorsports
Jamie@dundonmotorsports is offline  
Old 12-09-2017, 11:00 PM
  #155  
[email protected]
Basic Sponsor
Rennlist
Site Sponsor

 
Jamie@dundonmotorsports's Avatar
 
Join Date: Jan 2016
Location: Gig Harbor, Wa
Posts: 1,436
Default

Originally Posted by Jimmy-D View Post
Maybe some one can answer this. What are the side mufflers for???

Is they anything negatively impacted by removing them like so many do??

I ask this because back in 2014; Porsche invited most of the .1 14 Owners to their new Center that had just opened in Atlanta as sort as a courtesy thing for hanging in their while the engines were being replaced. In one of the seminars, they had a GT3 up on a lift and they were reviewing and discussing a bunch of the components of the GT3. I had asked about the putting on a rear bypass and that did not seem to matter much but when mentioned about taking off the side mufflers the guy looked at us like we were nuts. He was trying to explain why they were important but it kind of went over my head

Short answer is they're there for Euro sound limits at idle and cruise. Nothing detrimental to their removal except more of the expansion happens in the center muffler. This puts stress on the center and if you track a lot can lead to cracking of the center muffler. The design is the same as the 997 GT3's that failed often...

If valved side deletes are used, no drone is added.

The weight savings and removal of heat, for some, is more important...

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

www.dundonmotorsports.com
Facebook.com/dundonmotorsports
Instagram @dundon_motorsports
Jamie@dundonmotorsports is offline  
Old 12-10-2017, 10:27 AM
  #156  
disden
User
 
Join Date: Apr 2012
Location: Indiana
Posts: 1,546
Default

Originally Posted by Veltracon View Post
Best sounding/looking exhaust out there. GRP center bypass.

my GT3 is getting dropped off tomorrow at Rahalís for his bypass exhaust. Iíll chime in soon with my thoughts. It sounded simply amazing on his R when he fired it up for me, so Iím excited and expecting good things!
disden is offline  
Old 12-10-2017, 11:28 AM
  #157  
goin2drt
Super User
 
goin2drt's Avatar
 
Join Date: Mar 2015
Location: Kentucky finally made it out of Peoples Republik of Kalifornia
Posts: 2,588
Default


Originally Posted by disden View Post


my GT3 is getting dropped off tomorrow at Rahalís for his bypass exhaust. Iíll chime in soon with my thoughts. It sounded simply amazing on his R when he fired it up for me, so Iím excited and expecting good things!
I just installed mine on my .1. It is absolutely amazing and you will love it. It sounds SO good.
goin2drt is offline  
Old 12-10-2017, 12:21 PM
  #158  
disden
User
 
Join Date: Apr 2012
Location: Indiana
Posts: 1,546
Default

I love the wider exhaust tips, loooks much more aggressive. Iíve only put Sharkwerks on my prior cars, but was open for a change.

Originally Posted by goin2drt View Post



I just installed mine on my .1. It is absolutely amazing and you will love it. It sounds SO good.
disden is offline  
Old 12-10-2017, 12:27 PM
  #159  
Seanlabonte
Platinum Dealership
Rennlist
Site Sponsor

 
Seanlabonte's Avatar
 
Join Date: Mar 2016
Location: Fresno, CA
Posts: 496
Default

Originally Posted by disden View Post
I love the wider exhaust tips, loooks much more aggressive. Iíve only put Sharkwerks on my prior cars, but was open for a change.


Looks great!
__________________
Sean LaBonte @ Porsche Fresno

Porsche Fresno -www.porschefresno.com
Audi Fresno - www.audifresno.com
BMW Fresno -www.bmwfresno.com
McLaren Scottsdale - www.mclarenscottsdale.com
Porsche Fresno Lease Specials
cell: 951-973-9470
email: [email protected]
Instagram
Seanlabonte is offline  
Old 12-10-2017, 12:37 PM
  #160  
disden
User
 
Join Date: Apr 2012
Location: Indiana
Posts: 1,546
Default



On my RS
disden is offline  
Old 12-10-2017, 04:15 PM
  #161  
DutchGT3
User
 
Join Date: Oct 2017
Location: SF Bay Area
Posts: 33
Default

Originally Posted by [email protected] View Post
Short answer is they're there for Euro sound limits at idle and cruise. Nothing detrimental to their removal except more of the expansion happens in the center muffler. This puts stress on the center and if you track a lot can lead to cracking of the center muffler. The design is the same as the 997 GT3's that failed often...

If valved side deletes are used, no drone is added.

The weight savings and removal of heat, for some, is more important...

Jamie
Jamie,

I'm in line for a new .2 GT3 in spring. It will be my daily driver while also planning on taking it to the track quite a bit, some of those track days will be at Laguna. I get that most people want a louder exhaust, but due to work, neighbors and Laguna I actually am in the camp of needing a quiet exhaust. I can opt for the GPS based valve solution, but am also keenly interested in your Orange exhaust.

What complete exhaust setup would you recommend when the goal is to get the best track results while passing sound at Laguna and staying California legal? Orange plus side bypass? Please quantify the gains (weight, hp, heat mgmt, etc.) you get from each component a bit more. For example, don't fully understand the heat removal comment you made.
DutchGT3 is offline  
Old 12-10-2017, 06:02 PM
  #162  
[email protected]
Basic Sponsor
Rennlist
Site Sponsor

 
Jamie@dundonmotorsports's Avatar
 
Join Date: Jan 2016
Location: Gig Harbor, Wa
Posts: 1,436
Default

Originally Posted by DutchGT3 View Post
Jamie,

I'm in line for a new .2 GT3 in spring. It will be my daily driver while also planning on taking it to the track quite a bit, some of those track days will be at Laguna. I get that most people want a louder exhaust, but due to work, neighbors and Laguna I actually am in the camp of needing a quiet exhaust. I can opt for the GPS based valve solution, but am also keenly interested in your Orange exhaust.

What complete exhaust setup would you recommend when the goal is to get the best track results while passing sound at Laguna and staying California legal? Orange plus side bypass? Please quantify the gains (weight, hp, heat mgmt, etc.) you get from each component a bit more. For example, don't fully understand the heat removal comment you made.
Hi Dutch.

There are a few things in play here let me see if I can pull them apart.

1. Passing Sound

The Orange will definitely help you pass sound at Laguna. We've tested on 2 997's with and without side deletes and 2 991 GT3's one with side deletes that was blowing a 104db and one with stock side mufflers. All of them passed sound with or without the side mufflers.

http://www.dundonmotorsports.com/por...center-muffler

2. Reducing Weight.

The side mufflers are one of the heaviest and largest parts of the exhaust system on a GT3 (I believe about 30lbs but would have to go check my notes). Removing it from the car is an easy way to shed weight. Substituting Valved Side Muffler Deletes helps to reduce weight, and with the valves drone is kept in check at highway speeds (the valve switches the exhaust flow to a longer path in the center muffler to keep the drone frequencies canceled out).

Muffler and Valved side deletes as a complete kit will be available after the holidays (need to get the mufflers finished first!)

3. Removing Heat

The side mufflers also get pretty hot and that heat is close to the rear tires. To help the tires stay at a more controlled temperature, removing the side mufflers help. It also helps with engine bay temps a bit.

4. HP gains
Gaining horsepower is about getting more air into and out of the cylinders. Properly designed headers are an effective way to do this. All of the side muffler deletes and center mufflers discussed so far are all after the catalytic converter and won't make any meaningful horsepower gains. The gains come from the headers, our 200 cell street headers maximize gains while keeping catalytic converters in the system. On the 991.1 GT3 we saw gains of 30-35whp on the RS 4.0L gains were 25-30whp, we expect slightly better on the 991.2 due to the cam designs and the current torque output, but haven't been able to test one at our facility yet.

Here's a link to our 991.1/991.2 Street Headers
http://www.dundonmotorsports.com/por...catted-headers


A complete system of our Street headers and an Orange Muffler would be a potent combination for track use. Ticks all the boxes above, increased power, reduced dB level, no drone and less weight!

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

www.dundonmotorsports.com
Facebook.com/dundonmotorsports
Instagram @dundon_motorsports
Jamie@dundonmotorsports is offline  
Old 12-11-2017, 01:15 AM
  #163  
DutchGT3
User
 
Join Date: Oct 2017
Location: SF Bay Area
Posts: 33
Default

Thanks for the detailed response. Makes sense.

Originally Posted by [email protected] View Post
Muffler and Valved side deletes as a complete kit will be available after the holidays (need to get the mufflers finished first!)
I'll definitely keep my eye out for the complete kit. Perfect timing for when my car arrives in the spring.
DutchGT3 is offline  
Old 12-11-2017, 10:42 PM
  #164  
disden
User
 
Join Date: Apr 2012
Location: Indiana
Posts: 1,546
Default

I had Graham Rahal Performance bypass exhaust placed today on my GT3.2. The sound is simply amazing. Iíve only used Sharkwerks in the past, but was willing to try something different. I couldnít be happier. Highly recommend. Looks great too. Sorry no clips yet!
disden is offline  
Old 12-12-2017, 12:03 AM
  #165  
CAlexio
Super User
 
CAlexio's Avatar
 
Join Date: May 2013
Location: San Francisco, CA
Posts: 8,083
Default

Originally Posted by disden
I had Graham Rahal Performance bypass exhaust placed today on my GT3.2. The sound is simply amazing. Iíve only used Sharkwerks in the past, but was willing to try something different. I couldnít be happier. Highly recommend. Looks great too. Sorry no clips yet!
Big difference?... more growl as most say, or anything else of note?
CAlexio is offline  

Thread Tools
Search this Thread
Quick Reply: Best Exhaust for a 991.2 GT3


Contact Us About Us Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

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: