Every time an aftermarket company, race team or OEM maker wants to add power to a car, they change the intake and exhaust to "reduce back pressure". Yet there are always nay sayers that exclaim that no significant power can be made this way. If that is so, why is this always the first step in modifying any car. I just read the Excellence article on the Gemballa CGT and again they mod the exhaust to lessen back pressure and gain a claimed 53 BHP.

I know this subject has been beat to death, so forgive me....just had to vent

 

Hello could you provide us scans of this article, poor european we are?

Thanks

 

Sorry I don't have a scanner and Excellence Mag doesn't usually have their articles online. Maybe someone else could help.

 

There are gains to be had on a modern pollution controlled vehicles. The gains are small if your only mod is the exhaust and often come at the expense of low end torque and sometimes lower HP on average for the sake of a larger peak HP 'marketing' number.

But if it makes more power at higher RPMS thats fine for race teams / cars who live at that high rpm all day long. Not so for street driven cars.

Removing converters and replacing with higher flow (or non at all) can produce gains - for obvious reasons. There is HP hiding, the production 997 / 997S car was not built with maximizing HP from every possible angle.

Im am exhaust guy, I do my research and buy what makes power and sounds good to my ears.

 

I watched numerous clips of 997 with exhaust on the web and so far I like the Techart exhaust the best. Tubi is nice but it doesn't sound as Porsche as the techart. Next on my list is AWE and EVO

 

https://www.6speedonline.com/forums/...ad.php?t=72068

One thread at a time, please.

 

Heres a bunch of exhaust clips. I kind of like the Tubi personally.

http://www.europeanspeed.com/exhaust997.htm

 

If Gemballa claims a 53 hp gain from just LESSENING the backpressure , how much of the 911 engine hp do you think is required to push the combustion gases out thru the factory exhaust?

And there was a thread a few months ago where some unscrupulous jerks claimed up to 30 hp from a new K&N air intake. All Dyno proven ( of course ) Lol

If these figures are to be believed , I should get close to 500 hp if I were to remove my exhaust and the intake filter .

Yes , there are a few ( A FEW ) hp to be gained thru less restrictive exhausts and intakes ( at higher rpm and with a corresponding loss of torque on the lower end ,as was stated above)

I tend to believe that factory engineers know a little bit more about what to attach to their engines after 50 years , than some aftermarket muffler peddlers.

The only reason I see someone changing the mufflers on a daily driver is for a different sound . Not for any, mostly imagined, hp gains( personally I like the PSE , especially since it can be turned off occasionally ) Lol