Cayman GTS 4.0 exhaust sound

Highly recommend going with Over axel pipes, they will bring out that perfect amount of aggressive growl, without going overboard.

Not to mention our Memorial day sale just kicked-off, feel free to snag a set at 10% off MSRP!

(P.S. If you're concerned about drone, we also offer a resonated version!)

Any impact to warranty from installing oap?

manellis said:

Any impact to warranty from installing oap?

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its a "cat-back" item and if you don't mess with engine tuning it wouldn't have any effect, similar to changing the muffler

GPF units on the flat 6 engine are not monitored (no sensors)

Hal H said:

GPF units on the flat 6 engine are not monitored (no sensors)

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Without monitoring, how it can manage regeneration?

Wrbgolf said:

Received my 4 th Cayman (GTS 4.0) in February and love it. Only negative is the downshift exhaust sound vs my last one. (2014 Cayman S with sport exhaust option.) There is no “gurgle sound“ in GTS. Any comments on why and any fixes for it without losing warranty and spending $5 k?

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Just trying to clarify what you mean, are you looking for higher volume or are you missing the ‘Pops and bangs’ on the over run? The solution will be different depending on what you want to achieve.

AlexMi said:

Without monitoring, how it can manage regeneration?

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just Euro market models have monitored GPFs on the 4.0 models - its likely to monitor the efficiency of the GPF, like the secondary sensors on the catalytic converters

the North American market models are different emissions standards vs. the Euro spec

Hal H said:

its a "cat-back" item and if you don't mess with engine tuning it wouldn't have any effect, similar to changing the muffler

GPF units on the flat 6 engine are not monitored (no sensors)

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Thanks Hal. Are you saying that since it won't throw an engine code, Porsche won't care for warranty purposes? I was aware that it's unmonitored for US cars, but would like to avoid impacting the warranty regardless.

manellis said:

Thanks Hal. Are you saying that since it won't throw an engine code, Porsche won't care for warranty purposes? I was aware that it's unmonitored for US cars, but would like to avoid impacting the warranty regardless.

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No codes - changed mine out in the first 200 miles.

Even sounds better when the Active Cylinder Control (cyl. deactivation) goes into effect. With the stock OAPs, it just sounds...odd

Flat6 OAPs & a two-mode Cargraphic valve controller installed on mine at 12 miles.

Sounds much better and accentuates all of the lower RPM shifts. Plus the gurgling is fantastic. Highly recommend this combo for about $2K.

Gusbubs said:

Flat6 OAPs & a two-mode Cargraphic valve controller installed on mine at 12 miles.

Sounds much better and accentuates all of the lower RPM shifts. Highly recommend this combo for about $2K.

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This is the way. I had dealer to my AOP at delivery, so I've never heard my car in stock form.
I did the Cargraphics at 500 miles.

manellis said:

Thanks Hal. Are you saying that since it won't throw an engine code, Porsche won't care for warranty purposes? I was aware that it's unmonitored for US cars, but would like to avoid impacting the warranty regardless.

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The educated answer is that modifications only affect warranty coverage on the parts that the modification affects. So say you have an issue with the PSE valve in your exhaust, it's possible a dealer will decline to assist you in having it repaired under warranty. But say you have suspension issue, then the dealer has no legal reason to deny you service under the warranty. This is how it works in the USA. But there are dealers out there who will find any excuse possible to deny you warranty coverage on anything and then you will have to challenge them on that.

Best way to handle this is to build relationships with dealerships and service advisors who understand how things work and that requires you to understand it a bit as well. Or don't do any mods at all but that's not an option for me.

Wiscombe64 said:

Just trying to clarify what you mean, are you looking for higher volume or are you missing the ‘Pops and bangs’ on the over run? The solution will be different depending on what you want to achieve.

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Missing the downshift pops and bangs. Upshifting with acceleration creates an elevated sound…lower type roar. Downshift is just a higher rev sound. No pops and gurgles….

Wrbgolf said:

Missing the downshift pops and bangs. Upshifting with acceleration creates an elevated sound…lower type roar. Downshift is just a higher rev sound. No pops and gurgles….

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Thanks, that’s what I suspected you meant. I’m not an expert on this but I’d say changing exhaust elements will not fundamentally affect this because it is controlled by the engine mapping / fuelling via the ecu. The pops will be excess fuel igniting in the exhaust on the overrun. On the 4 cylinder cars, putting the engine into Sport mode provides lots of pops and crackles but normal / Sport Plus does not. Personally I don’t like those sounds so I haven’t investigated it for the six cylinder, anyone else know if there’s a tune that can help?

Hal H said:

just Euro market models have monitored GPFs on the 4.0 models - its likely to monitor the efficiency of the GPF, like the secondary sensors on the catalytic converters

the North American market models are different emissions standards vs. the Euro spec

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The question is technical: how does the GPF work without a pressure sensor telling it it's clogged? How does it decide when to use fuel to regenerate?

Wiscombe64 said:

Thanks, that’s what I suspected you meant. I’m not an expert on this but I’d say changing exhaust elements will not fundamentally affect this because it is controlled by the engine mapping / fuelling via the ecu. The pops will be excess fuel igniting in the exhaust on the overrun. On the 4 cylinder cars, putting the engine into Sport mode provides lots of pops and crackles but normal / Sport Plus does not. Personally I don’t like those sounds so I haven’t investigated it for the six cylinder, anyone else know if there’s a tune that can help?

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The reason why there is no popping sound in sport plus, only in sport is that it`s just for a show.
I also don`t like that.

PeC said:

The reason why there is no popping sound in sport plus, only in sport is that it`s just for a show.
I also don`t like that.

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Completely agree, it’s just a pointless waste of fuel! On a turbo car, there ‘might’ be some justification as part of an anti-lag methodology, such as in WRC cars. On a road car I think it’s just obnoxious, each to their own……

Wiscombe64 said:

Thanks, that’s what I suspected you meant. I’m not an expert on this but I’d say changing exhaust elements will not fundamentally affect this because it is controlled by the engine mapping / fuelling via the ecu. The pops will be excess fuel igniting in the exhaust on the overrun. On the 4 cylinder cars, putting the engine into Sport mode provides lots of pops and crackles but normal / Sport Plus does not. Personally I don’t like those sounds so I haven’t investigated it for the six cylinder, anyone else know if there’s a tune that can help?

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My 2014 Cayman S had this "pop and gurgle" downshift sound. That is exactly what I am looking for.
Thanks for all of the replies.

Wiscombe64 said:

Completely agree, it’s just a pointless waste of fuel! On a simple turbo car, there ‘might’ be some justification as part of an anti-lag methodology, such as in WRC cars. On a road car I think it’s just obnoxious, each to their own……

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It makes the car sound like a cheap hot hatch modified by a 20 year old. Quite pointless.
In sport mode one can turn off the exhaust noise. using the button on the dash.
Porsche has developed the turbo technology on the Boxster S to the point where the anti lag system simply works and doesn't need any blipping or pop off valve or anything else to make lag virtually imperceptible.