dragon43

Hello all, I'm looking to finalize the purchase of a 992 GT3 in the next couple of weeks.

With my 991 GT3, the first and most essential modification is the exhaust. I ended up having a few iterations, starting with a GMG center bypass, then to a used iPE titanium rear section, and finally settling on the AWE SwitchPath. The iPE was an impulsive purchase and I think stainless sounds better than titanium. The AWE was perfect, with volume and drone removal...which was the weakness of the GMG. I attributed this to the fact the GMG deleted the factory valve operation.

Because of the hefty headers on the 992 GT3, having larger cats than 991 and the GPFs, I was wondering if valves are still needed to reduce drone as much as possible when cruising. So, my question (as indicated by the thread title) is: does the 992 GT3 need a valved exhaust?

Peter992

Probably I didnt get your question, valved exhaust is standard on GT3. With standard exhaust it is loud after few thousands kilometers with very small difference between closed and opened valves. The main difference is the exhaust note is little bit crispier, not pretty noticeable louder. Anyway, valve opens automatically above some rpm.

dragon43

I'm looking for an aftermarket system. I'm asking if the system needs valves or if I could delete them (as if they were open at all times), without the unwanted consequence of having too much boomy drone when cruising (0-3500 rpm)

DodoBrd

I’d say it depends on the aftermarket exhaust you get

fwiw, I have a titanium JCR exhaust with valves entirely deleted and I love the sound at every rpm

dragon43

JCR and Dundon are what I'm liking right now. Also, seeing you're in Frisco, I'm in Southlake. Do you go to any local events? I'd love to hear your car first hand

User 81423

there is no difference between 991 and 992 relative to your question. your question is also highly subjective, drone tolerance is interpreted differently by everyone.

so I think you’re going to have a hard time getting an answer.

My hunch is If you felt like you needed a valved system to fit your preferences, you will need it on 992 as well.

dragon43

I think you're right, my thought was, a non-valved catback exhaust may not drone because of the larger cats and filters. However, a full exhaust that has headers with smaller/higher-flowing cats may be the best option, I'm looking for some guidance.

User 81423

yep I gotcha - my personal favorite brand is Soul and their service is superb. Give them a call for a professional opinion

DodoBrd

for sure we can meet up to hear it in person. I also deleted the OPF (which all 992 GT3s come with but 991.2 GT3s did not have) just so you know.

I’ll send you a PM

Jbravo23

Full dundon setup, street headers and loud center. Paired cargraphic valve controller with it. Valves ALWAYS stay open.

I had the exact same setup on my 991.2 but had the exhaust button on the center console coded to have valves either open or closed. Once again always had them open.

To answer your question if you’re like me then technically I don’t think you need to have a system with valves. I have yet to turn the valves to closed or even the oem setup. YMMV

dragon43

My thoughts exactly, have been craving a Dundon setup for a year or two now, thanks for the advice!

InfamousS/T

I am currently in the market right now, looking for Dyno numbers, sound is after . Anything on Soul ?

JCR-Porsche

The 992 exhaust arrangement is totally different to 991 and also the 992 chassis is generally a little better sound insulated too. Add on top the 992 engine having the individual throttle bodies which result a change to the drone frequency inside the cabin and it's really quite a different prospect.

You're right in saying that drone is entirely subjective however I would go out on a limb and say I would challenge anyone to say that our non valved non silenced rear section drones on a 992 GT3 at any RPM. It's really have your cake and eat it kind of deal on the 992 GT3

JC

APEX GT3

Valve delete by Soul is a nice mod for $300.
allows you to enjoy the GT3 howl from 3200-4500 which otherwise would be somewhat muted by the valves.

I did go with the Akrapovic titanium headers, 200cel, and muffler and it was a bit too loud with the drone for me. Sold it and the valve deletes are currently keeping me satisfied for the inside of the car sound for this car season. The 992 GT3 is a bit louder than the 991.2 in terms of intake noise as well.

i won’t be going back to any valved system, but thinking of adding JCR or R1Motorsport muffler(if they offer a valveless option) over the winter for next year. SharkWerks also has a valve option but it’s not titanium.

dragon43

The tone is significantly different, especially in the midrange, I suspect due to the ITBs. Additionally, the aforementioned different exhaust configuration makes a difference as well. As JCR is based in the UK, don't Euro cars have larger/more particulate filters? Do you think this would impact the drone? A previous comment had a JCR race pipe and US OPFs deleted...sound level seems pretty perfect.