Dundon GT4/Spyder Race Header Group Buy
09-17-2017, 11:52 PM
#751
Three Wheelin'
I picked up a slightly used set from a rennlister- excited to install the headers.
I'll post a pre Dyno and post like others. I expect my baseline numbers to be a bit lower as I'm in Denver and the air is a tad thin up here.
Also, my car currently has an akrapovic cat back system in place. It will be interesting to see how that sounds and if any difference in power is present from other graphs.
But to think, I managed to snag an akrapovic system and dundon header for 5k
I'll post a pre Dyno and post like others. I expect my baseline numbers to be a bit lower as I'm in Denver and the air is a tad thin up here.
Also, my car currently has an akrapovic cat back system in place. It will be interesting to see how that sounds and if any difference in power is present from other graphs.
But to think, I managed to snag an akrapovic system and dundon header for 5k
09-18-2017, 12:06 AM
#752
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Gains with an akra rear are a bit less than stock due to changes in resonance... with a Cobb tune can get most of it back.
I picked up a slightly used set from a rennlister- excited to install the headers.
I'll post a pre Dyno and post like others. I expect my baseline numbers to be a bit lower as I'm in Denver and the air is a tad thin up here.
Also, my car currently has an akrapovic cat back system in place. It will be interesting to see how that sounds and if any difference in power is present from other graphs.
But to think, I managed to snag an akrapovic system and dundon header for 5k
I'll post a pre Dyno and post like others. I expect my baseline numbers to be a bit lower as I'm in Denver and the air is a tad thin up here.
Also, my car currently has an akrapovic cat back system in place. It will be interesting to see how that sounds and if any difference in power is present from other graphs.
But to think, I managed to snag an akrapovic system and dundon header for 5k
09-18-2017, 12:15 AM
#753
Three Wheelin'
02-18-2018, 11:54 AM
#754
Three Wheelin'
Just wanted to update this with some real world experience.
My good friend has a 991.2 manual GT3 and we managed to do a couple fun pulls from 20ish to the top of 3rd shifting into 4th the other day. My car has ipd/Gt3tb/bmc/akra catback/Dundon header and their Cobb tune.
After three pulls, we both were amazed. The gt4 maybe lost by a tire length. Yes, really. It was dead even on three back to back to back pulls.
My good friend has a 991.2 manual GT3 and we managed to do a couple fun pulls from 20ish to the top of 3rd shifting into 4th the other day. My car has ipd/Gt3tb/bmc/akra catback/Dundon header and their Cobb tune.
After three pulls, we both were amazed. The gt4 maybe lost by a tire length. Yes, really. It was dead even on three back to back to back pulls.
02-18-2018, 12:44 PM
#755
Burning Brakes
Just wanted to update this with some real world experience.
My good friend has a 991.2 manual GT3 and we managed to do a couple fun pulls from 20ish to the top of 3rd shifting into 4th the other day. My car has ipd/Gt3tb/bmc/akra catback/Dundon header and their Cobb tune.
After three pulls, we both were amazed. The gt4 maybe lost by a tire length. Yes, really. It was dead even on three back to back to back pulls.
My good friend has a 991.2 manual GT3 and we managed to do a couple fun pulls from 20ish to the top of 3rd shifting into 4th the other day. My car has ipd/Gt3tb/bmc/akra catback/Dundon header and their Cobb tune.
After three pulls, we both were amazed. The gt4 maybe lost by a tire length. Yes, really. It was dead even on three back to back to back pulls.
02-18-2018, 12:48 PM
#756
Rennlist Member
Just wanted to update this with some real world experience.
My good friend has a 991.2 manual GT3 and we managed to do a couple fun pulls from 20ish to the top of 3rd shifting into 4th the other day. My car has ipd/Gt3tb/bmc/akra catback/Dundon header and their Cobb tune.
After three pulls, we both were amazed. The gt4 maybe lost by a tire length. Yes, really. It was dead even on three back to back to back pulls.
My good friend has a 991.2 manual GT3 and we managed to do a couple fun pulls from 20ish to the top of 3rd shifting into 4th the other day. My car has ipd/Gt3tb/bmc/akra catback/Dundon header and their Cobb tune.
After three pulls, we both were amazed. The gt4 maybe lost by a tire length. Yes, really. It was dead even on three back to back to back pulls.
02-18-2018, 01:54 PM
#757
Three Wheelin'
I know my post is going to receive some skepticism, as it should. But we were both quite surprised by the results.
02-18-2018, 01:57 PM
#758
Rennlist Member
what know what your car making at the wheels?
02-18-2018, 09:05 PM
#759
Three Wheelin'
02-19-2018, 12:31 AM
#760
Three Wheelin'
Hah, that's awesome! Like for like the .2 GT3 should be way faster but given a modded GT4 vs a new GT3 with a tight engine and a heavy list of options and this could make sense. There's a massive hp difference between the two cars but the torque difference is only 30ft/lbs and the GT4 is 160lbs lighter (~5% in weight which would be like about 18ft/lbs). Add headers, exhaust, intake, and tune to the GT4 and most of that torque advantage goes away. Throw in a light spec GT4 (pccbs, lwbs) vs heavy spec GT3 (iron rotors, 18 ways, bose, lift, etc) and the weight difference could push 200lbs. At higher speeds the HP difference should help the GT3 pull away easily but at lower speeds running through a gear or two I could see the mods and weight difference keeping it surprisingly close.
02-19-2018, 12:53 AM
#761
Three Wheelin'
Hah, that's awesome! Like for like the .2 GT3 should be way faster but given a modded GT4 vs a new GT3 with a tight engine and a heavy list of options and this could make sense. There's a massive hp difference between the two cars but the torque difference is only 30ft/lbs and the GT4 is 160lbs lighter (~5% in weight which would be like about 18ft/lbs). Add headers, exhaust, intake, and tune to the GT4 and most of that torque advantage goes away. Throw in a light spec GT4 (pccbs, lwbs) vs heavy spec GT3 (iron rotors, 18 ways, bose, lift, etc) and the weight difference could push 200lbs. At higher speeds the HP difference should help the GT3 pull away easily but at lower speeds running through a gear or two I could see the mods and weight difference keeping it surprisingly close.
Gt4- pccb/lwb/hre p101 wheels.
gt3- iron brakes/ lift / but he does have lwb.
02-19-2018, 07:16 AM
#762
Three Wheelin'
Cda (drag area) is ~4.5% lower on the GT4 too 
02-19-2018, 07:26 AM
#763
Rennlist Member
02-19-2018, 12:15 PM
#764
Three Wheelin'
Contact Dundon for headers + tune- Jamie was great to work with.
02-19-2018, 12:52 PM
#765
Rennlist Member