Best Exhaust for a 991.2 GT3
09-08-2018, 03:33 PM
#706
so, how do you control the CEL. this is the million dollar question. dundon headers on .1 do not have an issue, but .2 trigger the CEL. I have to believe this is a problem with the Catless header. Fabspeed tries to eliminate the CEL with o2 sensor relocation and angled sensor position, but this is an issue and without a tune, CEL headaches are stopping me from full headers.
09-10-2018, 05:24 PM
#707
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so, how do you control the CEL. this is the million dollar question. dundon headers on .1 do not have an issue, but .2 trigger the CEL. I have to believe this is a problem with the Catless header. Fabspeed tries to eliminate the CEL with o2 sensor relocation and angled sensor position, but this is an issue and without a tune, CEL headaches are stopping me from full headers.
We use O2 Simulators to avoid the CEL when doing the iPE catless headers. Works like a dream.
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09-10-2018, 06:10 PM
#708
modes Dundon Street Headers save 31 lbs can anyone confirm? Also how much weight would a 3RS titanium Center save with this system? Tks
09-15-2018, 10:30 PM
#710
09-16-2018, 05:20 AM
#711
09-17-2018, 11:10 AM
#712
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Haven't had a chance, and there are vids on YT that are way better than anything I could do. 
Yes OEM center. No negatives. Essentially stock level sound with valves closed, same character as OEM with valves open just a bit louder. Not crazy loud by any means, which is perfect for me.
I'm planning on tracking, so I may end up doing a dundon lifetime center muffler, not sure yet though.
Yes OEM center. No negatives. Essentially stock level sound with valves closed, same character as OEM with valves open just a bit louder. Not crazy loud by any means, which is perfect for me.
I'm planning on tracking, so I may end up doing a dundon lifetime center muffler, not sure yet though.
09-18-2018, 01:52 AM
#713
Three Wheelin'
Dundon just updated their site showing the 991.2 GT3 being dyno’d with and without their street headers. Without, they got nearly the same results as my car. 456 rwhp. The street headers supposedly add 20hp. Anxious to see the results with the race headers on the .2 and if they get CEL’s.
09-18-2018, 01:55 AM
#714
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Dundon just updated their site showing the 991.2 GT3 being dyno’d with and without their street headers. Without, they got nearly the same results as my car. 456 rwhp. The street headers supposedly add 20hp. Anxious to see the results with the race headers on the .2 and if they get CEL’s.
We’ll make a complete post soon. Ecu is in control for power gains, but we have a 991.2 GT3 engine on our race headers running a Bosch MS6 stand alone ecu so we can see how much the stock tune is holding things back...
https://www.dundonmotorsports.com/bl...t-header-dynos
09-18-2018, 10:51 AM
#715
+1 for Dundon. Have the catted system on my RS, the fitment is perfect, sounds awesome, no engine lights, no drone and customer service is just amazing! You can get the test pipes as well to swap the cats for track days if needed.
Oh, yeah and it adds an additional ~25whp if thats important
Oh, yeah and it adds an additional ~25whp if thats important
09-18-2018, 10:59 AM
#716
Three Wheelin'
nothing suooosed about it...
We’ll make a complete post soon. Ecu is in control for power gains, but we have a 991.2 GT3 engine on our race headers running a Bosch MS6 stand alone ecu so we can see how much the stock tune is holding things back...
https://www.dundonmotorsports.com/bl...t-header-dynos
Last edited by drdonger; 09-18-2018 at 12:14 PM.
09-18-2018, 03:09 PM
#717
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Also the 991.2 has far more ECU interaction, so more power is definitely available, just have to spend some time with the ECU to get her to like it...
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Dundon Motorsports
Gig Harbor, WA
253-200-4454
jamie@dundonmotorsports.com
www.dundonmotorsports.com
Facebook.com/dundonmotorsports
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09-18-2018, 04:11 PM
#719
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Nice that the stock .2 Manual makes 30 hp (flywheel) more than .1 RS
Very curious to see what happens without cats and with a tune...
Very curious to see what happens without cats and with a tune...
09-18-2018, 04:38 PM
#720
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Jamie