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I do have a theory, and its only that. I was looking at the Touring box yesterday. The design is so smooth and well done, it's kinda odd to lose power.
HOWEVER, one thing is apparent, the area where it breaths from is smaller than the stock box. So sitting on a dyno WITHOUT fresh air being
forced into it, the OEM box has an advantage, unlike when the car is between 60 and 150 mph, the Touring box will at minim match efficiency.
I believe this is the reason for showing the comparative loss. IMO this touring box was designed to perform with fresh air at speeds.
Hm... Isnt the intake part the same as OEM? If I recall correctly, the box with filters and the two feeding tubes are different. But the intake thing below the rear wing is the same and the air takes the same route?!?
Originally Posted by xBoost
I did test the header, both with no center section and with GMG center. The results were the same. Less mid range drop without center section.
The second post 443 whp number is with the header.
So the headers didn'T increase power at all? 443whp with headers, throttle body and tune vs. 445 with original headers but CMD?
Hm... Isnt the intake part the same as OEM? If I recall correctly, the box with filters and the two feeding tubes are different. But the intake thing below the rear wing is the same and the air takes the same route?!?
So the headers didn'T increase power at all? 443whp with headers, throttle body and tune vs. 445 with original headers but CMD?
Where are you running those times? I mean altitude and ambient temp... makes all the difference in the world on NA engines.
Seems I was wrong and I did a 6.8 later with an insane - 2000DA, but it did a just under 7 once with a more reasonable +900ft DA.
Here's a video of the German tuner getting 6.636:
Im in Florida (US) always warm or hot and humid LOL.
And the difference between our conditions must be insane. But what that time implies is, that GT3 will be neck and neck with my S2000 and I know for sure that wont happen. The car makes 500wtq and spins a bit at 60 if the tires arent hot. It did a 7.79 60-130 with full and pretty aggressive aero.
The next test I will have on Dundon canards and Verus Rear wing at 10 degrees. So that wont really help.
Im in Florida (US) always warm or hot and humid LOL.
Yeah that's not gonna help lol.
My car did the same times with or without the Dundon headers. They added some sound, and a bunch of tq low down, but the little part at the top where they blow past the stock headers in keeping the power between 8.5 and 9 was too small to make up for the loss in the 5 to 7K range. We tried tuning it out but when we tried to push it in the weak areas it just started knocking.
My car did the same times with or without the Dundon headers. They added some sound, and a bunch of tq low down, but the little part at the top where they blow past the stock headers in keeping the power between 8.5 and 9 was too small to make up for the loss in the 5 to 7K range. We tried tuning it out but when we tried to push it in the weak areas it just started knocking.
I updated the previous post.
Yea I remember reading that. Its quite possible the weight loss could be beneficial on track with the header and light center section.
Yes, that plus the fact they made it hard to pass sound is why I took them off. Stock header with side deletes is quite a bit lighter even with the stock center.
Yes, that plus the fact they made it hard to pass sound is why I took them off. Stock header with side deletes is quite a bit lighter even with the stock center.
Is that something you felt on track? vs all stock?
I only ever did 1 trackday with the car fully stock lol... but the weight saving is pretty massive so I think it helped the rear in terms of change of direction. When I took those boat anchors off I also swapped to a 5lb battery at the front so that balanced things out a bit.
I also ran the Verus wing at 10 deg when I got it used, as it lacked the lower angle mounts. Up to 124 mph it will hold the car back a little but not too much, it gets tricky at higher speeds though. I run it at 5 degrees now which seems a good compromise in terms of downforce to drag. It still has way more rear stability this way than it did with the Manthey wing but trap speeds are similar.
I only ever did 1 trackday with the car fully stock lol... but the weight saving is pretty massive so I think it helped the rear in terms of change of direction. When I took those boat anchors off I also swapped to a 5lb battery at the front so that balanced things out a bit.
I also ran the Verus wing at 10 deg when I got it used, as it lacked the lower angle mounts. Up to 124 mph it will hold the car back a little but not too much, it gets tricky at higher speeds though. I run it at 5 degrees now which seems a good compromise in terms of downforce to drag. It still has way more rear stability this way than it did with the Manthey wing but trap speeds are similar.
Thats good info. Maybe I'll switch the the 5 degree mount for the rolling test.
For the track, the 10 degree angle, might even try the 15. I do however have the newer dundon canards which are huge compared to the original ones done with Verus.
E85 power upgrade came by just switching the fuel or did you tune ignition for it?
I added .5 degree (1/2) I know I squeezed out everything out of it, and the timing is already quite higher than I run on any other engine, Porsche :shrug: So I kept it there.
Could there be more? Maybe, but Im tuning it for exactly how I would use it on track and for customers.
Thats good info. Maybe I'll switch the the 5 degree mount for the rolling test.
For the track, the 10 degree angle, might even try the 15. I do however have the newer dundon canards which are huge compared to the original ones done with Verus.
While track and driving style dependent, I'm pretty sure that you'll find it tending towards understeer at higher speeds even with 10 deg. I don't have canards but run the cup front lip on my .2 together with lower cup fender liner/tunnels which do meaningfully increase front DF. But my experience was on the Ring where there's loads of corners between 100-160 MPH.
There's this video on YT with Jackie Ding driving a car with Verus aero and he had it set to 4 or 5 degrees even with the Verus splitter on.
Easy to experiment with at the track obviously. The low angle risers go all the way up to 9 degrees so I do think that's the most useful one to have on.
Last edited by JCviggen; Mar 13, 2026 at 12:14 PM.
I added .5 degree (1/2) I know I squeezed out everything out of it, and the timing is already quite higher than I run on any other engine, Porsche :shrug: So I kept it there.
Could there be more? Maybe, but Im tuning it for exactly how I would use it on track and for customers.
But does it pull timing with 93 octane gas? E85 doesn't make more power per se?!? or does it? I would expect power gains coming from more timing (way more than 0.5deg difference) and/or running lean mixture. If you didn't change mixture and just added 0.5 deg timing... that power gain would by way higher than realistic.
