Damn!! 3.4 cans(for pse mod) to sell
06-17-2007, 11:04 AM
#17
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Porsche-Smile - as Chuck stated above I have done this exact mod (MK II mod) to 3.4L mufflers and to 3.6L mufflers. The 3.4L cans were a little louder than my stock 3.6L mufflers, but I was disappointed that the sound wasn't louder and lower.
Then I did the same mod on the 3.6L mufflers. They sound MUCH better than the 3.4L mufflers. IMO, they sound about 85% to 90% of true PSE mufflers (I have heard true PSE mufflers only once).
Below is some information about the different muffler versions and the different PSE MOD versions.
MUFFLERS
3.4L mufflers - have a straight pipe coming from the cat (left muffler shown in 1st pic)
3.6L mufflers - have a accordion pipe coming from the cat (right muffler shown in 1st pic).
Both versions of the stock OEM mufflers have 3 internal chambers, which the exhaust must pass through prior to exiting the outlet pipe.
PSE MODS
PSE MK I mod - a small pipe (usually 3/4" to 1 1/4" in diameter) is added between the inlet pipe (coming from the cats) to the outlet pipe which holds the exhaust tips. The exhaust passing through the "new" pipe never goes through the muffler, so the sound is louder and lower. The MK I mod is shown in the 2nd pic (note that the MK I mod has been done on 3.6L mufflers).
PSE MK II mod - the "cap" at the corner of the muffler is removed. Then a hole is cut into the outlet pipe. Then a 2" to 2 1/4" diameter pipe is connected from the new opening on the muffler to the hole in the outlet pipe. This mod allows some of the exhaust to bypass the 3rd chamber in the muffler. The resulting sound is louder and lower than the stock muffler sound. The MK II mod is shown in the 3rd pic.
Either mod (MK I or MK II) can be done to either the 3.4L or the 3.6L muffler. However, from what I have heard in person and from video clips, if you are working with 3.4L mufflers and want to get the sound that most resembles true PSE sound, then you should do the MK I mod. Someone here recently did the 3.4L and a slightly different version of the MK I mod and posted a sound clip. As near as I could tell from that sound clip, those mufflers it sounded just like my 3.6L mufflers with the MK II mod, which I like VERY much.
If you want to get as close to true PSE sound as possible, listed below are my recommended/not recommended combinations. Remember these are just my opinions, and as the lawyers would write.... your mileage may vary.... no guarantee, expressed or implied.... Void where prohibited.... etc., etc., etc.
Rating Scale - If Stock Mufflers = 0 and true PSE Mufflers = 10, listed below are my "ratings" of the various combinatins of the mufflers/mod combinations.
3.4L mufflers
o MK I mod – recommended - I have heard this on a video clip and this combination sounds good. Rating = 8
o MK II mod - NOT recommended - I did this personally and the result is not worth the effort. Rating = 3
3.6L mufflers
o MK I mod - recommended - I have heard this on a video clip and this combination sounds good. Rating = 8
o MK II mod – recommended - I have this now and I love it. Rating = 9
Hope this helps!
Then I did the same mod on the 3.6L mufflers. They sound MUCH better than the 3.4L mufflers. IMO, they sound about 85% to 90% of true PSE mufflers (I have heard true PSE mufflers only once).
Below is some information about the different muffler versions and the different PSE MOD versions.
MUFFLERS
3.4L mufflers - have a straight pipe coming from the cat (left muffler shown in 1st pic)
3.6L mufflers - have a accordion pipe coming from the cat (right muffler shown in 1st pic).
Both versions of the stock OEM mufflers have 3 internal chambers, which the exhaust must pass through prior to exiting the outlet pipe.
PSE MODS
PSE MK I mod - a small pipe (usually 3/4" to 1 1/4" in diameter) is added between the inlet pipe (coming from the cats) to the outlet pipe which holds the exhaust tips. The exhaust passing through the "new" pipe never goes through the muffler, so the sound is louder and lower. The MK I mod is shown in the 2nd pic (note that the MK I mod has been done on 3.6L mufflers).
PSE MK II mod - the "cap" at the corner of the muffler is removed. Then a hole is cut into the outlet pipe. Then a 2" to 2 1/4" diameter pipe is connected from the new opening on the muffler to the hole in the outlet pipe. This mod allows some of the exhaust to bypass the 3rd chamber in the muffler. The resulting sound is louder and lower than the stock muffler sound. The MK II mod is shown in the 3rd pic.
Either mod (MK I or MK II) can be done to either the 3.4L or the 3.6L muffler. However, from what I have heard in person and from video clips, if you are working with 3.4L mufflers and want to get the sound that most resembles true PSE sound, then you should do the MK I mod. Someone here recently did the 3.4L and a slightly different version of the MK I mod and posted a sound clip. As near as I could tell from that sound clip, those mufflers it sounded just like my 3.6L mufflers with the MK II mod, which I like VERY much.
If you want to get as close to true PSE sound as possible, listed below are my recommended/not recommended combinations. Remember these are just my opinions, and as the lawyers would write.... your mileage may vary.... no guarantee, expressed or implied.... Void where prohibited.... etc., etc., etc.
Rating Scale - If Stock Mufflers = 0 and true PSE Mufflers = 10, listed below are my "ratings" of the various combinatins of the mufflers/mod combinations.
3.4L mufflers
o MK I mod – recommended - I have heard this on a video clip and this combination sounds good. Rating = 8
o MK II mod - NOT recommended - I did this personally and the result is not worth the effort. Rating = 3
3.6L mufflers
o MK I mod - recommended - I have heard this on a video clip and this combination sounds good. Rating = 8
o MK II mod – recommended - I have this now and I love it. Rating = 9
Hope this helps!
Last edited by gota911; 06-17-2007 at 11:22 AM.
06-18-2009, 05:16 AM
#18
wow, great info. I have a quesiton regarding the MKI mod though: is there a reson that the small pipe that is added between the inlet pipe and outlet pipe is J shaped? Would it yield the same results if it were a small straight pipe?
Also, would there be a difference in sound if the pipe were bigger/smaller?
Also, would there be a difference in sound if the pipe were bigger/smaller?
06-18-2009, 02:51 PM
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The only reason that I can think of as to why the small pipe for the MK I mod is a J-pipe is that it should be easier to slide both ends of the J-pipe into the holes cut in the inlet and outlet pipes.
I think a straight pipe would give you the same sound, but probably be a little more difficult to fit into the newly cut holes in the inlet and outlet pipes.
I think a straight pipe would give you the same sound, but probably be a little more difficult to fit into the newly cut holes in the inlet and outlet pipes.
06-18-2009, 03:01 PM
#20
I did WaynesWorld's 3.4 mod recently, and if I were to do it again, I would use larger j pipe. I used the 1-1/4" o.d., and it's not a bad sound, it's just a little too quiet, and not as low pitched as I would like. Of course, I was going from OEM MkII PSE, so maybe I was just spoiled.
I would rate this mod not quite halfway between stock and PSE in volume.
A 2" direct bypass (inlet pipe to outlet pipe) on the 3.4 cans might be just about perfect.
I would rate this mod not quite halfway between stock and PSE in volume.
A 2" direct bypass (inlet pipe to outlet pipe) on the 3.4 cans might be just about perfect.
06-18-2009, 03:04 PM
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I did WaynesWorld's 3.4 mod recently, and if I were to do it again, I would use larger j pipe. I used the 1-1/4" o.d., and it's not a bad sound, it's just a little too quiet, and not as low pitched as I would like. Of course, I was going from OEM MkII PSE, so maybe I was just spoiled.
I would rate this mod not quite halfway between stock and PSE in volume.
A 2" direct bypass (inlet pipe to outlet pipe) on the 3.4 cans might be just about perfect.
I would rate this mod not quite halfway between stock and PSE in volume.
A 2" direct bypass (inlet pipe to outlet pipe) on the 3.4 cans might be just about perfect.
If you aren't sure you like what the 3.4L are doing for you, I have a passenger PSE for sale here: https://rennlist.com/forums/996-foru...n-400-s-h.html
06-18-2009, 03:08 PM
#23
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after my share of being out on a limb, making some really great choices (I seem to remember a GT2 wing in there somewhere) I though better of re-inventing the mod
06-18-2009, 03:17 PM
#24
Kevin,
If you aren't sure you like what the 3.4L are doing for you, I have a passenger PSE for sale here: https://rennlist.com/forums/996-foru...n-400-s-h.html
If you aren't sure you like what the 3.4L are doing for you, I have a passenger PSE for sale here: https://rennlist.com/forums/996-foru...n-400-s-h.html
The 1-1/4" bypass pipe hack isn't bad at all, it's just not as good as it could be with a larger pipe.
06-18-2009, 04:16 PM
#25
I am very tempted to find a welder to put in a 2" pipe between the inlet and outlet. I just hope it doesn't sound terrible. I don't think anyone has tried such a large size for the MK1 (3.4)
06-18-2009, 06:02 PM
#26
I do think some guys have done the 2" bypass on 997's. You might search on that and see what you find. I know one guy who did it, and he loved it. However, he moved to OEM 997 PSE because he got a used set for next to nothing....
06-18-2009, 10:34 PM
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