Originally Posted by JCR-Porsche

Our system uses inline silencers, they're 50mm internal diameter which is sufficient for flow and also effective enough from a silencing point of view. It would be possible to force the valves closed and run in this mode however its not something that we would recommend, the OPF already creates a significant amount of back pressure due to the design of the flange. It wouldn't be wise to add any restrictions as this would only exacerbate the issues. Hence why we ditched the OEM tips as that's like running a fire hose with a domestic sprinkler attachment fitted to the end.

Neither our silenced or non silenced system drones and neither is what I would consider to be loud. Our non silenced system is still below the max dB of a 100% stock 981 GT4 at WOT. The OPF is a very effective silencer in its own right.

JC

Originally Posted by JCR-Porsche

Our system uses inline silencers, they're 50mm internal diameter which is sufficient for flow and also effective enough from a silencing point of view. It would be possible to force the valves closed and run in this mode however its not something that we would recommend, the OPF already creates a significant amount of back pressure due to the design of the flange. It wouldn't be wise to add any restrictions as this would only exacerbate the issues. Hence why we ditched the OEM tips as that's like running a fire hose with a domestic sprinkler attachment fitted to the end.

Neither our silenced or non silenced system drones and neither is what I would consider to be loud. Our non silenced system is still below the max dB of a 100% stock 981 GT4 at WOT. The OPF is a very effective silencer in its own right.

JC

Originally Posted by DocMo

From a sound tone and pitch perspective, is there a difference between the two versions? Which one sounds “better” and more “refined” if any?

what’s the expected delivery time for the non silenced version?

Originally Posted by GAZZ

Thanks for the reply.
If one is keeping the OEM headers and the OPF in place this would make complete sense.

What I should have mentioned is Im considering replacing the entire system with catless headers, and having the cats located where the OPF is. So in open mode it would be completely straight through and extremely loud.

Originally Posted by JCR-Porsche

Our system uses inline silencers, they're 50mm internal diameter which is sufficient for flow and also effective enough from a silencing point of view. It would be possible to force the valves closed and run in this mode however its not something that we would recommend, the OPF already creates a significant amount of back pressure due to the design of the flange. It wouldn't be wise to add any restrictions as this would only exacerbate the issues. Hence why we ditched the OEM tips as that's like running a fire hose with a domestic sprinkler attachment fitted to the end.

Neither our silenced or non silenced system drones and neither is what I would consider to be loud. Our non silenced system is still below the max dB of a 100% stock 981 GT4 at WOT. The OPF is a very effective silencer in its own right.

JC

Originally Posted by Westcoast

Considering the silencers and indeed the entire system, what is the expected lifespan and what kind of warranty is offered? Some companies are offering a limited lifetime warranty.

Originally Posted by JCR-Porsche

Neither our silenced or non silenced system drones and neither is what I would consider to be loud. Our non silenced system is still below the max dB of a 100% stock 981 GT4 at WOT. The OPF is a very effective silencer in its own right.

JC

Originally Posted by 2XIPA

I may be wrong but it seems most of these designs may inhabit the rear diffuser from working properly.

Originally Posted by 2XIPA

I may be wrong but it seems most of these designs may inhabit the rear diffuser from working properly.

Originally Posted by kart125

I cant wait to get my car to start playing with it!

What could be useful to help us choose the perfect setup for our needs would be a table with dB comparo of silenced vs non-silenced race pipe alone and in combination with OPF delete pipes (and maybe with the stock 981 GT4 in the table for comparison). I want it loud but dont want to be above approved dB level at local track (I know a stock 981 GT4 is OK). Ideally I dont want to add the silenced tips!

Originally Posted by nhnguy12

When do you expect to release your OPF delete and how loud compared will it be compared to a stock 981 GT4? Will you be replacing the entire mid-pipe section or just the OPF module itself?

Thanks!

Originally Posted by JCR-Porsche

...Silenced & Race Catted (for use with our Inconel Race Manifolds which delete their factory cats

JC