Hi all

Can anyone discuss if there are any exhaust sound differences between these three cars with or without factory sport exhaust?

I was told that a C4S sounds different than the C2S but have no idea why there would be any difference?

Thanks,

Anil.

 

The only difference will be if one has sport exhaust and the other does not. Both cars have identical engines and equipped with the same exhaust. Both will sound the same.

 

Who told you this?

 

the dealer told me this

 

That's disappointing to hear.

 

Really disappointing, for a dealer to tell you that. But maybe he simply meant that one of the cars had PSE and the other did not...

The difference is only whether the S car has PSE or not, and doesn't matter if a C2 or C4 (S cars are all 3.8 engine). The base 3.4 991 will sound different from S cars without PSE AND cars with PSE because center muffler and side mufflers are different in the base 3.4 (LOL unless the 3.4 is optioned with PSE!).

Also, consider whether one had the powerkit or not. That might be the only difference I can think of in engine tone between two S cars with PSE or without.

Everyone confused now?

 

The GTS is supposed to sound even meaner than the non GTS models. But I can't say I've heard it in person.

 

If that's the case, then it is due to the powerkit -- which is standard on the GTS. But being a GTS won't make it sound different than an S with the same PSE and powerkit options.

Just sayin.....

 

GTS will sound just a tad different- different intake setup and different internal engine hardware mods. I'd go GTS!!

 

Thanks guys.

 

I have a base 3.4 with the PSE would this setup sound similar to the S with the PSE?

 

I'm not sure if you're guessing that's the case and frankly I don't know, but reviews and Porsches own promotional video states the acoustics have been tuned for the GTS specifically.

 

You are referring to the Powerkit. You can add that option to any S car. And yes, the Powerkit does create a different sound. As to whether there is a powerkit specific to the GTS, I'll have to do more research. Could be I guess, based on the second part of the quote below....

From an interview on FlatSixes, Friederich Seiler, PAG Engine Tuning Engineering Manager: "The Powerkit's revised intake manifold was responsible for somewhere around 50% of the power gain, replacing the engine's standard plastic intake for a custom made complicated dual-plenum aluminum intake. It is difficult to describe in words, but there is a large flapper at the top of the intake tract to keep the left bank separate from the right bank until higher RPM, and then a little flapper in each of the cylinder runners that opens up to take advantage of oscillating tube pressure at high RPM to provide a less restrictive flow to each cylinder above . The way it was described, it basically allows the air that is pushed back from the closing of an intake valve to flow into other open cylinders, rather than providing a pressure differential that prevents high flow from entering each cylinder unimpeded. This system is said to help promote torque through shorter intake runners at low RPM, and then when open, allows more horsepower at higher RPM.

For the other 50% of the power gain, Porsche had to get really creative. To help promote greater flow, Porsche took the standard cylinder head from the Carrera S parts bin and simply optimized it for use in the Powerkit equipped GTS. The intake and exhaust ports have both been extremely smoothed by a new process. Porsche essentially created a viscous paste, similar to a lapping compound, and they just push this paste through the tracks of the cylinder head until they are super smooth and don't impede airflow as much. The intake camshafts were also replaced with units that provide a higher valve lift and longer duration."

The second part makes it sound like there are bits specific to the GTS, but what is described I believe is true for the Powerkit option, in general. Anyone care to correct me on this?

 

I "think" the Powerkit comes as a package to get to 430 hp, whether it's GTS or not. I'm not sure as to the PDK mapping on S vs. GTS.