How did you go with this?
Do you get 3 modes of operation or 2?

 

I haven’t purchased anything yet as I’m in no rush. Hopefully I’m flying to Germany next month and then I’m going to swing by Schmid M. to look at both systems. Not sure about the modes but I will keep you posted.

 

I contacted them its just 2 modes open or closed.
There is a risk with 100% always closed valves on an OEM system that it can cause damage due to back pressure. An after market cat back should prevent that.

 

That’s the same for the Cargraphic system. It looks like they do 3 modes on some type of cars but not on this one. No big deal (for me).

 

Why not just one exhaust pathway done right. I really what I have on my car. It's a 2014 Cayman S with Cargraphic longtube headers with cats, stock muffler, and their curved merged tips sounds great as some others have noted on the forum. Great flat-six sound, especially at the track. Not too loud around the neighborhood, wakes up when you want it too at WOT at all RPMs, and no raspy boomy sounds from a poorly engineered product.

On the new 718 GT4, when you open the valves all the time, the exhaust just goes straight out without much damping or crossover from the muffler. With soo much less resistance on the large primary undampened pipes, the small ones going into the muffler will have little airflow and not contribute much to the sound. In OEM form, the OPF acts as a dampener of the sound to the straight out large primary pipes, but what happens to things when that is removed? It appears to get louder, but necessarily sound that much better by many accounts. Seems to me some resonators or a mandatory muffler pathway are needed to attenuate the sound to a certain point. Not with muffler baffling to add restriction, but a straight through design, with left to right mixing and some appropriate stainless steel dampening material inside the muffler can.

I understand these exhaust pieces need to be interchangeable and plug and play at first. However, down the road it may make sense to pair a single pipe over the axle with a dedicated muffler and ditch the two pipe scenario and all of its expensive merges and flanges. You could have varying levels of damping in the muffler like Dundon does, and possibly have an additional resonator where the OPF used to be for customers who want or need a quieter exhaust note. I am just not seeing how this button thing is working to well for the exhaust of this particular version of the GT4.

Maybe I don't know what I'm talking about, but I'm just throwing some thoughts out there for people to chew on. The experts can comment on these ideas and we shall see what happens as more products enter the marketplace. Seems like we already have a number of great people working on this so far. I particularly like the HelmholtzI resonators that a few of the vendors are using to damping cabin drone. That has always been a problem for aftermarket exhausts.

 

I am picking it up this morning and will report :

 

So, first impressions:
- more volume at idle (same as right after a cold start) and low rpm
- a bit more pops and bangs when lifting the throttle (not that much overall but I personally don’t need more of that)
- less of an audible transition between low rpm and high rpm, which is logical with the flaps open all the time.
- the less good thing is that my ears were buzzing when driving the car slowly or at least without pushing hard between around 2.5k rpm and a bit beyond 3k rpm. Not nice.

Overall satisfied of the change, but glad I took the route of a remote-controlled valve control vs having the valves open all the time as I have the feeling that this can become tiring under certain driving conditions.

 

Crazy to hear it drones even with stock exhaust and opf fitted! At least u can turn it off if u need a break

 

When you had the buzzing was that with the Auto/startstop activated? -disable, buzz goes away.

 

I tried that and it was better indeed but there was still a sort of increase in volume around 2.5/3k rpm that did sound buzzy to my ears. Maybe I am overly sensitive to that, I don’t know.

But no issue whatsoever if you keep revs above 3k rpm or under 2k rpm. And much less if you drive the car as it should be driven, ie fast ;-)

 

Stock exhaust with the valves unplugged just adds drone in the area of the curve that the valves would have been otherwise closed.

The design of the OPF assembly has a lot to answer for.

JC

 

So does your OPF delete pipe minimize or eliminate the drone?

 

All but removes it entirely when combined with factory rear (and unplugged valves)

JC

 

Cool and what about in combination with your Silenced Valved Race pipe exhaust? This my desired configuration.

 

A bit more?​ ​​​I haven't heard any pops & bangs, at what rpm are you hearing it from stock ? You have US / EU or RoW spec?

Do you have Home link system to try if the Cargraphics Remote control can be programmed with it ?

Cheers