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Has anyone captured actual gains on a dyno before and after installing catted headers on a 981? I am not looking for dyno charts from vendors but actual customers. Is it a noticeable change especially on the GTS?

Thanks.
 

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We have some on GT4s :D Sorry, we're a vendor..


Happy to answer any questions!

Josh
 

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These are real dyno numbers from my car on the same machine a few months apart with similar weather conditions. This was the first custom tune done by COBB right after the accessport came out. Just cargraphics catted headers and the tune with stock air filters.
266901
 

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So $3000 headers don't do much alone. It would be interesting to see the tune w/ stock headers.
 

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So $3000 headers don't do much alone. It would be interesting to see the tune w/ stock headers.
It's not that the headers don't do anything alone. It's that the stock tune limits power output so the Cayman motor won't make as much power as the same motor in a 911. A tune by itself will make roughly 15hp, maybe a smidge more depending on fuel. The main thing the tune does, is remove the limiter logic on the torque output that the factory tune comes with. This allows the headers to properly breathe and results in additional power.

Also, with a pro-tune, they would have adjusted the cam angles to optimize flow against the specific headers on the car. This will also account for a lot of the additional gains.
 

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H=2 $3800 + INSTALL $1900+/HP
T=15 $1500 $100/HP
H+T=32! $5300 + INSTALL $166+/HP

This does indicate that unless you are going to do a tune too, don't waste your money on headers.
And also that the tune is more bang for the buck than headers.
 

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Just FYI, a header install is not $1900, at least not here. It's 5 hours for 986-981s, which is $475.

Even with a custom dyno tune it's way less than $1900. :)

H=2 $3800 + INSTALL $1900+/HP
T=15 $1500 $100/HP
H+T=32! $5300 + INSTALL $166+/HP

This does indicate that unless you are going to do a tune too, don't waste your money on headers.
And also that the tune is more bang for the buck than headers.
 

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I guess I wasn't clear, Joshua. The header is $3800, add whatever the install cost is and you are $3800+. For 2 hp that is $3800+ divided by 2 = $1900+ per hp. Using your $475 for install it is $2137.50 per hp.
 

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Oh gotcha, I see now. I don't read so good without my coffee.. :)

I guess I wasn't clear, Joshua. The header is $3800, add whatever the install cost is and you are $3800+. For 2 hp that is $3800+ divided by 2 = $1900+ per hp. Using your $475 for install it is $2137.50 per hp.
 

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Looks like you're just using the peak value @6500 though. The area under the curve is way better with the headers and stock tune. And of course improves further with a tune.

I guess I wasn't clear, Joshua. The header is $3800, add whatever the install cost is and you are $3800+. For 2 hp that is $3800+ divided by 2 = $1900+ per hp. Using your $475 for install it is $2137.50 per hp.
 
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