Dundon Street Header (catted) Testing on 991.2 GT3RS
04-19-2019, 12:51 PM
#31
It would be cool to see a dyno overlap of Dundons on a .1rs and .2rs
04-19-2019, 02:51 PM
#33
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This is not just for GT cars as I know it occurs in Caymans and other cars Porsche offers in a manual or PDK. The PDK cars do make less power at the wheels than the same version of the car in a manual and in just the Cayman alone I have seen several GTB1 spec PCA Club Racing Caymans with this difference. You can call this BS but the numbers do back up the fact that the manual transmission cars are generally more efficient at putting power to the ground than the PDK cars.
04-19-2019, 03:08 PM
#34
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Very interesting. So the setup in the dyno is your catted headers combined with your valved side deletes? How much does your full street system weigh with stock .2 3RS muffler compared with full stock system? How much does your Orange (quiet) muffler weigh compared to stock .2 3RS muffler?
What is the likelihood of burning up the stock muffler running your full street system? How often do CEL’s pop up using this system? Is there an easy way to clear the CEL codes and, more importantly, verify the CEL is exhaust related and not a separate issue that needs investigation?
Finally, how noticeable is the 4-5k torque drop compared to stock from a driving perspective, is it noticeable? Any other users with input on this?
I’m wanting to pull the trigger. Thanks!
What is the likelihood of burning up the stock muffler running your full street system? How often do CEL’s pop up using this system? Is there an easy way to clear the CEL codes and, more importantly, verify the CEL is exhaust related and not a separate issue that needs investigation?
Finally, how noticeable is the 4-5k torque drop compared to stock from a driving perspective, is it noticeable? Any other users with input on this?
I’m wanting to pull the trigger. Thanks!
1. The Middle (orange) line in the dyno is street header system only (no intake mods) , green line is stock, purple line is street headers, prototype airbox, 93mm TB and Big Mouth Center Plenum.
2. You save about 40lbs with the street system compared to stock mainly from the elimination of the side mufflers
3. If you used one of our Lifetime mufflers (recommended for tracked cars) you would save about 25lbs (our muffler is about 15lbs heavier than the Ti OEM RS center muffler)
4. 991.1 RS hasn't cracked the Ti muffler that we're aware of using the Street headers, the 991.2 RS makes substantially more power, so we recommend for a tracked car to get a lifetime muffler to be safe. It "should" be OK, but the Ti mufflers are notoriously fragile...
5. No CEL at all with the catted system if there are no leaks. It's always a good idea to get a $20.00 code reader from Amazon just in case, especially at the track as the yellow light isn't very helpful
6. No torque loss with the system, see #1
Shoot me an email, we're finishing the next batch
Should be many cars there both 991.2RS, 991.2 GT3, 991.1 RS and 991.1 GT3 with our street headers installed.
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Dundon Motorsports
Gig Harbor, WA
253-200-4454
jamie@dundonmotorsports.com
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Dundon Motorsports
Gig Harbor, WA
253-200-4454
jamie@dundonmotorsports.com
www.dundonmotorsports.com
Facebook.com/dundonmotorsports
Instagram @dundon_motorsports
Last edited by Jamie@dundonmotorsports; 04-20-2019 at 06:54 PM.
04-20-2019, 06:35 PM
#35
Thanks for the quick response. So the dyno results from original post are with stock side mufflers? Do you have dyno results with street headers and side muffler deletes? Thanks.
Hi Johnny,
1. The Middle (orange) line in the dyno is street headers only, green line is stock, purple line is street headers, prototype airbox, 93mm TB and Big Mouth Center Plenum.
2. You save about 40lbs with the street system compared to stock mainly from the elimination of the side mufflers
3. If you used one of our Lifetime mufflers (recommended for tracked cars) you would save about 25lbs (our muffler is about 15lbs heavier than the Ti OEM RS center muffler)
4. 991.1 RS hasn't cracked the Ti muffler that we're aware of using the Street headers, the 991.2 RS makes substantially more power, so we recommend for a tracked car to get a lifetime muffler to be safe. It "should" be OK, but the Ti mufflers are notoriously fragile...
5. No CEL at all with the catted system if there are no leaks. It's always a good idea to get a $20.00 code reader from Amazon just in case, especially at the track as the yellow light isn't very helpful
6. No torque loss with the system, see #1
Shoot me an email, we're finishing the next batch
Should be many cars there both 991.2RS, 991.2 GT3, 991.1 RS and 991.1 GT3 with our street headers installed.
1. The Middle (orange) line in the dyno is street headers only, green line is stock, purple line is street headers, prototype airbox, 93mm TB and Big Mouth Center Plenum.
2. You save about 40lbs with the street system compared to stock mainly from the elimination of the side mufflers
3. If you used one of our Lifetime mufflers (recommended for tracked cars) you would save about 25lbs (our muffler is about 15lbs heavier than the Ti OEM RS center muffler)
4. 991.1 RS hasn't cracked the Ti muffler that we're aware of using the Street headers, the 991.2 RS makes substantially more power, so we recommend for a tracked car to get a lifetime muffler to be safe. It "should" be OK, but the Ti mufflers are notoriously fragile...
5. No CEL at all with the catted system if there are no leaks. It's always a good idea to get a $20.00 code reader from Amazon just in case, especially at the track as the yellow light isn't very helpful
6. No torque loss with the system, see #1
Shoot me an email, we're finishing the next batch
Should be many cars there both 991.2RS, 991.2 GT3, 991.1 RS and 991.1 GT3 with our street headers installed.
04-20-2019, 06:51 PM
#36
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So to answer your question, no, all of our dyno's for header systems complete with our valved side deletes. What I was getting at was that the middle line doesn't include the intake side modifications.
Take a look on our website, lots of data there, dyno's, blog posts with videos etc...
https://www.dundonmotorsports.com/po...aders?carid=40
04-20-2019, 07:04 PM
#37
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more update on this once the car is back from Thill and we can get it on the dyno...
The air filter in the touring is pretty darn nice, but we will test ours from the winged GT3 on one as we're able to.
We're pretty happy with the performance of the setup so far, car drives normally, 300miles no CEL
Combo of Headers and Airbox/93mm TB makes a significant difference over stock... 52lbft at the wheels and 45whp and this is without any ram air.
04-20-2019, 07:24 PM
#38
Drifting
Wait what? Headers + a new throttle body is giving you 50+ whp gain?
Photos of this new throttle body and plenum?
Photos of this new throttle body and plenum?
04-20-2019, 07:34 PM
#39
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Dont have pics of the TB/Center as we were testing them for drivability. I’ll get pics up after the holiday
04-20-2019, 07:43 PM
#40
Looks great. Is it likely that the same intake box will fit the Touring? Or will it require and new design?
04-20-2019, 07:56 PM
#41
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How much and when can I order it all?
04-20-2019, 08:03 PM
#44
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How's the noise level? My 2019 GT3RS barely passes sound at oour noise iimited track. with the OEM exhaust. I'm guessing that better flow - more power = louder?
Best,
Best,
04-20-2019, 08:47 PM
#45
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That does get tricky for sure. It’s one of the reasons we made our Quiet Lifetime Muffler. Reduces dB’s about 10-12dB over stock. The quiet muffler and turn downs seem to do the trick for all but the craziest of sound restrictions. We have bolted in the quiet muffler on a 991.2 Gt3 and passed sound at Laguna. YMMV as most tracks just have a sound meter but no idea of the physics of what they’re measuring. dBA, dBC etc...