Open the rear hole on 958 Cayenne S muffler? (photo)
#16
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Still waiting for an answer on this. I think on PSE it's open and has a valve control.
Maybe it's just a matter of drill open and put a cutout type valve?
I'm too chicken **** to try it.
Maybe it's just a matter of drill open and put a cutout type valve?
I'm too chicken **** to try it.
![hiha](https://rennlist.com/forums/graemlins/roflmao.gif)
#19
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I'm almost certain it looks exactly like that with the secondary ports welded shut. I can't think of a good reason that porsche would make 2 different mufflers for V8 cars. Plus, there's the PSE upgrade that can be done on any V8 cayenne. I think it would help if someone could find PSE install instructions. I bet it says to cut out that second hole and install new quad tips. With secondary having a power controlled solenoid.
#20
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Didn't take too long... I found install manual.
https://www.design911.co.uk/uploads/...5804420000.pdf
Looks like the rear muffler is different, but one could but all the pieces and get it done.
https://www.design911.co.uk/uploads/...5804420000.pdf
Looks like the rear muffler is different, but one could but all the pieces and get it done.
Last edited by F SANE IL; 09-10-2022 at 08:52 AM.
#26
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If someone does this before I get to try, please post up.
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joe12s (09-11-2022)
#27
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I offered someone on FB market $100 for a SC muffler. If he ever agrees, I'll open up those second holes and it it seems ok, I'll get the gts tail pipes. Possibly get some wireless solenoids to open/close those secondary pipes.
If someone does this before I get to try, please post up.
If someone does this before I get to try, please post up.
![](https://cimg7.ibsrv.net/gimg/rennlist.com-vbulletin/2000x1504/image_bc377d2509c5670b7c5933b72c16d45be53987c6.jpg)
#28
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![hiha](https://rennlist.com/forums/graemlins/roflmao.gif)
Your drawing makes sense. Wonder if the PSE muffler is different not only in having 2 extra holes, but also different internals. I will defeat this.
#29
Instructor
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I'm so close to cutting mine off, if nothing else so I don't hear the power steering pump. Still not found anyone who's done it to a 958 though so a little worried it'll be too loud
#30
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If you know how to weld and have tools, shouldn't be a problem. Use hole saw, then weld back those second holes. I just don't have the tools or knowledge