Dundon Headers-wow!
04-11-2018, 01:20 PM
#46
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Since you anticipate the same power level with both race and catted header, do the differences simply boil down to: the race will be louder and more apt to be held at the consistently higher temps/revs seen on a track, whereas the catted version would be somewhat quieter and able to pass smog?
The nice thing about running it this way is you take off the rear tire and you can get at the cat and swap it for a test pipe for track days if you were so inclined. Or leave it there to try and help pass sound at sound restricted tracks.
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Dundon Motorsports
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Dundon Motorsports
Gig Harbor, WA
253-200-4454
jamie@dundonmotorsports.com
www.dundonmotorsports.com
Facebook.com/dundonmotorsports
Instagram @dundon_motorsports
04-28-2018, 08:39 PM
#47
Rennlist Member
Sooooo. Met up with a rennlist member (one of the people above who have the Dundon race headers on their gt4) to compare to my stock car today. Wow what a difference. 
First off the car definitely pulls harder at higher rpms with the header and a tune. I am running Cobb stage 1 91 tune. The header car was running another tune (stage 2?) also 91 but with headers. There’s always more feeling from passenger seat but even accounting for that there’s definitely some more torque.
The sound is ridiculous. Reminded me a little of armytrix exhaust I had once on my old 981S. Quite loud. But. Unlike that no drone. Even cruising or idling. The Dundon race headers sounded quiet and oem. It’s not until he valves open then it’s just insanity. No drone. Just loud. Pretty amazing you can cruise and be ok. But then get on gas and it’s like being in a tunnel without the tunnel.
I think for me ill I’ll be looking to go with something in the middle to loud range so leaning to Sport headers with 200 cel cats. Which means likely cargraphics or fabspeed. Or maybe Dundon will release their catted version soon?
Anyhow for anyone looking for “insane” level race headers will do it. I was amazed how much headers altered volume and sound keeping stock PSE exhaust.
First off the car definitely pulls harder at higher rpms with the header and a tune. I am running Cobb stage 1 91 tune. The header car was running another tune (stage 2?) also 91 but with headers. There’s always more feeling from passenger seat but even accounting for that there’s definitely some more torque.
The sound is ridiculous. Reminded me a little of armytrix exhaust I had once on my old 981S. Quite loud. But. Unlike that no drone. Even cruising or idling. The Dundon race headers sounded quiet and oem. It’s not until he valves open then it’s just insanity. No drone. Just loud. Pretty amazing you can cruise and be ok. But then get on gas and it’s like being in a tunnel without the tunnel.
I think for me ill I’ll be looking to go with something in the middle to loud range so leaning to Sport headers with 200 cel cats. Which means likely cargraphics or fabspeed. Or maybe Dundon will release their catted version soon?
Anyhow for anyone looking for “insane” level race headers will do it. I was amazed how much headers altered volume and sound keeping stock PSE exhaust.
09-02-2018, 11:14 AM
#48
Three Wheelin'
Our catted version is actually on the muffler side of things. So if someone wanted a catted system from us they would purchase race headers and catted side pipes to either attach to their existing muffler or to run with our valved GT3 muffler kit.
The nice thing about running it this way is you take off the rear tire and you can get at the cat and swap it for a test pipe for track days if you were so inclined. Or leave it there to try and help pass sound at sound restricted tracks.
The nice thing about running it this way is you take off the rear tire and you can get at the cat and swap it for a test pipe for track days if you were so inclined. Or leave it there to try and help pass sound at sound restricted tracks.
Jamie - What are your thoughts on the GT3 Throttle body and IPD plenum? If you're going to put the air filter, race headers, and tune the car does it make sense to put the throttle body + plenum on too? I know many have done this full package but there isn't much data on the before/after with the GT3 Throttle body and IPD plenum when combined with the air filter and Dundon headers.
09-02-2018, 02:03 PM
#49
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Jamie - What are your thoughts on the GT3 Throttle body and IPD plenum? If you're going to put the air filter, race headers, and tune the car does it make sense to put the throttle body + plenum on too? I know many have done this full package but there isn't much data on the before/after with the GT3 Throttle body and IPD plenum when combined with the air filter and Dundon headers.
09-02-2018, 04:05 PM
#50
Three Wheelin'
If I were to already have the GT3 TB and IPD Plenum, it it run OK with your standard Dundon COBB Tune or do you have a tune that can account of them? Do you by chance have dyne data of the following: headers/filter/tune vs headers/filter/tune/GT3 TB/IPD Plenum?
09-03-2018, 03:00 PM
#51
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If if you have it on the car already that’s fine. Tune will work. If you don’t have on the car, then is up to you. Shoot me an email for dyno’s and such...
09-03-2018, 11:08 PM
#52
Burning Brakes
I bought a set of Dundon headers from a forum member and we got them mounted up today. So much better than my expectations. Did not install the air filters yet. I may skip the K&N units and go with BMC. Still undecided. Cobb tuner will be arriving end of September - also purchased from a forum member.
Anyone still on the fence about these, come on down and order up. Incredible.
And a big thank you to Jamie for hooking me up with gaskets. No CEL generated so far.
Anyone still on the fence about these, come on down and order up. Incredible.
And a big thank you to Jamie for hooking me up with gaskets. No CEL generated so far.
09-03-2018, 11:22 PM
#53
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Air filters make a big difference. Either K&N or BMC are fine.
Glad we exceeded your expectations! Retorque those exhaust flange bolts after a tank of gas or so and you should Ben good to go!
I bought a set of Dundon headers from a forum member and we got them mounted up today. So much better than my expectations. Did not install the air filters yet. I may skip the K&N units and go with BMC. Still undecided. Cobb tuner will be arriving end of September - also purchased from a forum member.
Anyone still on the fence about these, come on down and order up. Incredible.
And a big thank you to Jamie for hooking me up with gaskets. No CEL generated so far.
Anyone still on the fence about these, come on down and order up. Incredible.
And a big thank you to Jamie for hooking me up with gaskets. No CEL generated so far.
09-13-2018, 11:37 PM
#54
Rennlist Member
I had a set put on my car yesterday along with plenum, TB and EVOMs tune. What a difference.....other than sound, biggest difference is smoother power delivery without lumpiness. They are loud though....so be prepared.
09-16-2018, 11:28 AM
#56
Rennlist Member
I know these are long tubes... do these remedy the mid range dip the same way that the Fabspeed / CGs do?
Have a set of Fabspeed sports on now... toying with the idea of trying out the Dundons.
Have a set of Fabspeed sports on now... toying with the idea of trying out the Dundons.
09-16-2018, 01:32 PM
#57
Rennlist Member
I'd do it. Better design, build quality and performance.
09-16-2018, 02:36 PM
#58
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