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Thanks John. It was covered very quickly by Joe during the portion of his video where he discusses the oem valves. So let me ask this specifically....
Were the 997.2 (2010 & 2011 timeframe) the point at which Porsche moved to the Helical brand valves? ... or was it not until the 2014 timeframe for the 991's?
Thanks John. It was covered very quickly by Joe during the portion of his video where he discusses the oem valves. So let me ask this specifically....
Were the 997.2 (2010 & 2011 timeframe) the point at which Porsche moved to the Helical brand valves? ... or was it not until the 2014 timeframe for the 991's?
Thanks in advance
Fantastic question!
From what I've seen Porsche phased these valves in towards the end of 997.2 GT3 production, and continued their use on any and all "performance" models. They are truly the best option for high-heat/high-output cars as they can withstand the torture, precisely why the other Tier 1 manufacturers have followed suit!
I inspected the valves on my early build 997.2, and see it does not have the same X castings as those shown in this screenshot from Joe's video (if that is indeed a difference in outer appearance)
So for those of us wanting to keep stock headers/cats, and keep the stock center box (in my case Ti on an RS), but deleting the side mufflers….
it basically will reduce weight, and get rid of valves. And act like an open valve system does in the car currently. Correct?
With the ti muffler boxes being more fragile there in the back, does that increase the pressure there at all on that running open all the time? Does that happen with regular street use, or more on high mileage track cars?
What are the best solutions out there for side muffler bypass?
It shouldn’t change the sound that much I wouldn’t think. It should sound exactly like an open value set up on a stock car.
not exactly (meaning it will not sound "exactly" the same),... primarily because there is a gap that the exhaust jumps across (inside the side mufflers when valves are open). So "some" of the gases escape & tumble inside the muffler even when the valves are open.
If you search around in this subforum, you'll see a ton of exhaust sound discussions. Side deletes, especially when paired with center bypass, do indeed make a difference. Then there are a lot of folks who go one step further & use 100 cell cats with bigger tube headers,... but that does not sound like a avenue you are persuing.
regarding Ti center mufflers (& your question about back pressure),... my understanding is that the design is the same, thus the gas flow (in both valve position scenarios) is also the same. But the aspect of Ti center mufflers cracking more easily does indeed have to do with heat cycles (& track use). If you're RS is only on the street, you probably don't need to worry about. BUT, if you think you'll ever want to sell the RS, and want a prestine center muffler to go with the car,... then yes maybe you consider swapping it out for a regular SS. Lots of collectors / drivers seem to do that.
We are such big fans of the OEM GT3 muffler, we decided to reverse engineer a T304l counterpart. It lends all the benefits of the OEM muffler, and is only a portion of the cost!
2014-2016.?
my titanium center mufflers never going to crack - its on the shelf!
Haha, same for me with both my 997.1 GT2 and 997.2 GT3 RS. Both titanium mufflers are in boxes and safe from destruction. I instead have SW center muffler delete (GT3 RS) and SW exhaust (GT2) instead.
We are such big fans of the OEM GT3 muffler, we decided to reverse engineer a T304l counterpart. It lends all the benefits of the OEM muffler, and is only a portion of the cost!
04-11-2022, 02:01 PM
A look inside the OEM GT3 Exhaust?
