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Like most things, exhaust sound is subjective. To me, with the PSE engaged, the sound is good, however I would like some more sound/volume.
In a 997.2, with the PSE and Sharkwerks (or other mid-muffler delete), the exhaust note is great at start up. As the car/engine warms up, the sound winds down - too quiet for me. I would like to keep
the PSE dual mode function, but have an additional exhaust volume increase.
I think that a "Gundo" type hack on the PSE mufflers, connecting the inflow and outflow pipes may add a bit to the exhaust note. Maybe something small in diameter like 1"- 1.5".
The Gundo/Fister mod flows part of the exhaust directly from the intake to the output pipe, while the PSE always flows all of the exhaust through the muffler regardless of setting. I recently saw the first photo on a UK 911 site showing a broken PSE cut open from a 997.1 (the 997.2 may be a little different but from the outside it appears similar in approach). The extra PSE pipe is on the right, the input is on the left. It's hard to see, but the center output has a long tube sitting close to a mesh, while the reflection to the right of the mesh reveals a simple open hole (maybe 3" or so) in the back internal plate. You can see it better in the second image from an x-ray from a non-PSE muffler which is built similarly but is missing the extra output and the input releases into the back chamber instead of the middle like the PSE.
In my experience the Gundo/Fister mod gives a little more raspiness/rawness in the exhaust note than the PSE while the PSE retains a little more throatiness (which I prefer but the cost premium is certainly high). The end result has similarities in volume but to my ear, the two are noticeably different in tone. I'd also assume the PSE retains a little more back pressure and has less effect on low end torque.
there also appears to be a hack/opening immediately as the inlet pipe enters the muffler
From watching this video, it seems like the PSE looks more like the Gundo hacks I have seen, whereas the Fister would add a pipe between the inlet and outlet to partially bypass the muffler completely. I will look around on the internet to see if there is a GundoFister super mod but I would also be interested in just heading my car with only the fister mod, next to an open PSE. if you did a Fister mod on a PSE it would necessarily make it louder but IDK what it would sound like when the flaps opened. I am assuming flaps closed = a C2S normal exhaust with the fister mod. With flaps open, a GundoFister!! haha.
Last edited by jamesinger; Aug 16, 2018 at 08:39 PM.
BTW, there is no way this is a good comparison but you can kind of get the idea if you look around 9:06 on the video above and then watch the video of my non PSE with the Fisters.
After all this, if I do change anything to add sound, it would be 1. headers, 2. 200 cell cats, and then if I ever found a PSE, I might try to put it on my car but I am really happy with the Fisters I have. From other cars I have owned, cat back exhausts are only a small part of the sound equation. They do make a huge difference but everything from the intake through to the tailpipes does affect sound (sometimes for the better and sometimes for the worser).
The Gundo hack is different than PSE. Gundo connects the inflow pipe to the out flow. PSE adds an outflow from another part of the muffler. A Gundo hack could still be added on to the PSE.
Has anyone tried this ?
Do you have PSE ? If so, which pipes did you connect ?
if you have PSE, then you just need to weld together the inlet and outlet pipes (aka the Gundo). If you only have standard exhaust, then weld together the PSE port and also the inlet/outlet pipes.
PSE exhaust
