808c2s

You should consider the Competition/Track silencer as they are true 2.5" dual openings that would mate up with your 2.5" OAP Cats from BC Fabs. Their Triangular silencer is the same size as the Touring silencer, thus will sound a bit more than Touring due to larger pipings w/o drone or resonance (Raspiness). That's the gist I got from Thomas @ Cargraphic.

porscheflat6

yes you should 😜

Rennolazine

looked at it but my cats mate to stock so the top path is closer to 2 in. Also the touring has more exhaust path collisions and im hoping its quieter valves closed and drones less than the competition. Thats the rationale, i want it silky smooth its still gonna be loud AF

808c2s

Oh really? I thought the Cats had both 2.5" openings? Oh well, in that case, you can't go wrong with the all-rounder Touring

Rennolazine

larger and smaller path is typical for most of these i think

Dorian C

LOL. So you were the one ahead of me. When I reached out to them, they said someone just paid for it. But all good, they offered me something else that I am very happy with, simply because I just missed this deal. So, happy ending!

I will do the headers with OEM muffler for now because all I am after is power.

808c2s

Hmmm, guess you're right. I guess the only company that makes 2.5" dual OAP would be Cargraphic for their OAP Cats and OAP optimized flow GPF.

Reedy

Placed the order and wired the money yesterday. Looking forward to hanging it up on the wall until the car arrives.

s85b50

I found it a while ago. It's called Porsche Sport Exhaust system.

SBARacing

Where is the valve that controls the OAP small/large pipe flow?
i thought the valve was on the center exhaust, but that is already passed that pipe, which means that removing/plugging the valve unit on the center doesn’t assure valves open throughout the entire system.

JCviggen

The valve is on the large dia. side of the back box. When closed, the valve forces the gas to use the small dia. path. When open, the gas takes the path of least resistance which is mostly the wide pipe plus a bit going through the small one because it remains open as well.

SBARacing

but the OAP has two diameter pipes as well and they are before the valve. So how does the valve after them make them flow in one way or the other?
it seams like only pipes after the valve would be affected, no?

JCviggen

Once the valve is closed the gas can't flow that way. The large path becomes a dead end street so the exhaust is forced through the smaller diameter path which branches off a foot or so before the valve. The exhaust gas will go wherever it can, the valve just takes away one of its options.

SBARacing

So it basically holds the path with a gas jam and the rest will go the other direction.

iliveoncaffiene

Yes, similar to a liquid (think water pipes in your house).
Conversely, when it's open, it's still going to partially flow out both paths. The majority of it will just flow through the path of least resistance.