Headers: The truth!!
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To the OP, as already mentioned...we have known this for years....LOL, but you still see the ebay header threads now and then, so perhaps good reminder for newbies.
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I had a conversation with a shop a few years ago and they basically said the same thing and stated thats why they never produced any. Now that same shop makes and sells headers for both the 996 and 997.... wonder why?
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I hate to stir the pot but I have to let you guys in on something that we've know for a while and even built a set of headers on our 996tt to prove the fact.
Headers on a stock based turbo do nothing!!
Years ago when we were developing Mitsubishi EVO headers we build a really nice large diameter header for a 400whp EVO VIII we had here. They did absolutely nothing, maybe 2 to 3 horsepower but nothing you couldn't attribute to standard dyno variance. The only think it did do was create lag from the large runners.
Now on to the 996tt headers.
We designed a nice set of headers with cast merge collectors and a cast head flange that has a smooth transition from the exhaust port to the tubular runners. After fitting them to the car and doing a direct back to back test (same day) the results were as expected, no real measurable gain. at 650wph each run was 5-10 hp in variance and there was no real measurable difference in the power level from the headers. The headers are larger internal diameter than stock.
The thing with turbo cars is that you can get away with a much more compromised header design than NA cars. As long as your exhaust back-pressure is significant you really won't benefit from a well designed header. In my opinion, until you get away from stock style turbo's and over 750whp it's better to stick with stock headers, otherwise it's just a waste of money. Better spend it on a turbo intake system, intercoolers, tune, etc...
I know this may create some heated debate but it is what it is and I'd rather see owners spend their money on parts that work and make horsepower.
-Martin
Headers on a stock based turbo do nothing!!
Years ago when we were developing Mitsubishi EVO headers we build a really nice large diameter header for a 400whp EVO VIII we had here. They did absolutely nothing, maybe 2 to 3 horsepower but nothing you couldn't attribute to standard dyno variance. The only think it did do was create lag from the large runners.
Now on to the 996tt headers.
We designed a nice set of headers with cast merge collectors and a cast head flange that has a smooth transition from the exhaust port to the tubular runners. After fitting them to the car and doing a direct back to back test (same day) the results were as expected, no real measurable gain. at 650wph each run was 5-10 hp in variance and there was no real measurable difference in the power level from the headers. The headers are larger internal diameter than stock.
The thing with turbo cars is that you can get away with a much more compromised header design than NA cars. As long as your exhaust back-pressure is significant you really won't benefit from a well designed header. In my opinion, until you get away from stock style turbo's and over 750whp it's better to stick with stock headers, otherwise it's just a waste of money. Better spend it on a turbo intake system, intercoolers, tune, etc...
I know this may create some heated debate but it is what it is and I'd rather see owners spend their money on parts that work and make horsepower.
-Martin
Thank a lot for sharing your info! However, I wonder if k24/20g isn't big enough to benefit from changing a set of good designed header? Tks!
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Because the people on 6speed in this section are a small percentage of the overall owners of Porsche's and that relates to many cars. People come in the door and want headers, they are cheap to re-produce and you can make a lot of money off them. In other words, there are a lot of people that are in fact still clueless, even here on the site, newbs come everyday not knowing.
Good chance the headers are from China an rebranded.
And the headers could be for NA car too.
Exactly, we do not include them in most packages unless they are using different turbos or power is near 700hp.
They are an option for guys that like to leave nothing on the table, however.
They are an option for guys that like to leave nothing on the table, however.
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So since ill soon have K24/20G on my car and i cant really decide after reading alot on the header subject .... would i benefit anything from a good header on a my GT2 or would it make it worse ?
Please advice gurus :-)
Please advice gurus :-)
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Joined: Jun 2008
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I hate to stir the pot but I have to let you guys in on something that we've know for a while and even built a set of headers on our 996tt to prove the fact.
Headers on a stock based turbo do nothing!!
Years ago when we were developing Mitsubishi EVO headers we build a really nice large diameter header for a 400whp EVO VIII we had here. They did absolutely nothing, maybe 2 to 3 horsepower but nothing you couldn't attribute to standard dyno variance. The only think it did do was create lag from the large runners.
Now on to the 996tt headers.
We designed a nice set of headers with cast merge collectors and a cast head flange that has a smooth transition from the exhaust port to the tubular runners. After fitting them to the car and doing a direct back to back test (same day) the results were as expected, no real measurable gain. at 650wph each run was 5-10 hp in variance and there was no real measurable difference in the power level from the headers. The headers are larger internal diameter than stock.
The thing with turbo cars is that you can get away with a much more compromised header design than NA cars. As long as your exhaust back-pressure is significant you really won't benefit from a well designed header. In my opinion, until you get away from stock style turbo's and over 750whp it's better to stick with stock headers, otherwise it's just a waste of money. Better spend it on a turbo intake system, intercoolers, tune, etc...
I know this may create some heated debate but it is what it is and I'd rather see owners spend their money on parts that work and make horsepower.
-Martin
Headers on a stock based turbo do nothing!!
Years ago when we were developing Mitsubishi EVO headers we build a really nice large diameter header for a 400whp EVO VIII we had here. They did absolutely nothing, maybe 2 to 3 horsepower but nothing you couldn't attribute to standard dyno variance. The only think it did do was create lag from the large runners.
Now on to the 996tt headers.
We designed a nice set of headers with cast merge collectors and a cast head flange that has a smooth transition from the exhaust port to the tubular runners. After fitting them to the car and doing a direct back to back test (same day) the results were as expected, no real measurable gain. at 650wph each run was 5-10 hp in variance and there was no real measurable difference in the power level from the headers. The headers are larger internal diameter than stock.
The thing with turbo cars is that you can get away with a much more compromised header design than NA cars. As long as your exhaust back-pressure is significant you really won't benefit from a well designed header. In my opinion, until you get away from stock style turbo's and over 750whp it's better to stick with stock headers, otherwise it's just a waste of money. Better spend it on a turbo intake system, intercoolers, tune, etc...
I know this may create some heated debate but it is what it is and I'd rather see owners spend their money on parts that work and make horsepower.
-Martin
ciesze sie ze bierzecie sie za tuning porscha !!!
pozdr.K
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I would only port your stock headers for you K24/20G.
