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Discussion Starter #1
Hi, i’ve watched many journalists reviews of the new GT4 and they all seem to comment on the particular filters in the new car, in terms of dampening the sound of the engine.

Where are these filters and can they be removed (easily)?

I under stand that everything is possible, but is this a major mechanic job that only Porsche should / can do, or should a specialist be able to do it?
 

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Hi, i’ve watched many journalists reviews of the new GT4 and they all seem to comment on the particular filters in the new car, in terms of dampening the sound of the engine.

Where are these filters and can they be removed (easily)?

I under stand that everything is possible, but is this a major mechanic job that only Porsche should / can do, or should a specialist be able to do it?
Where are you located?

Cars for the U.S. market will not have the particulate filter. They will have an inert substrate designed to replicate the backpressure of the particulate filter.

We don’t yet know how the substrate will affect sound or performance. Car and Driver posted some numbers after testing a European spec 992 S. If I remember correctly the 0-60 time was either dead even with or within a tenth of a 991.2 GTS. Kinda makes sense as they are on paper less than 10 horsepower apart. However, the 991.2 GTS was about 0.7 seconds faster 5-60. That is very significant. It was speculated the particulate could be robbing some low end torque. C&D will be testing U.S. models within a month so we’ll have our answer then.
 

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Thanks. I’m based in Ireland (EU).

I’m not concerned about minute performance loss... i’m more concerned about the loss of raw engine sound 🙂
 

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Hi, i’ve watched many journalists reviews of the new GT4 and they all seem to comment on the particular filters in the new car, in terms of dampening the sound of the engine.

Where are these filters and can they be removed (easily)?

I under stand that everything is possible, but is this a major mechanic job that only Porsche should / can do, or should a specialist be able to do it?
Where are you located?

Cars for the U.S. market will not have the particulate filter. They will have an inert substrate designed to replicate the backpressure of the particulate filter.

We don’t yet know how the substrate will affect sound or performance. Car and Driver posted some numbers after testing a European spec 992 S. If I remember correctly the 0-60 time was either dead even with or within a tenth of a 991.2 GTS. Kinda makes sense as they are on paper less than 10 horsepower apart. However, the 991.2 GTS was about 0.7 seconds faster 5-60. That is very significant. It was speculated the particulate could be robbing some low end torque. C&D will be testing U.S. models within a month so we’ll have our answer then.
Interesting that they simply don't just remove it for the NA bound cars, surely the ECU can compensate for a slight increase in exhaust flow...

I wouldn't be surprised that the aftermarket exhaust manufacturers will come up with a pass-through pipe to replace the inert substrate section especially if it is not really a emissions piece.
 
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