OK, anyone here who want's to see what the OEM exhaust really looks like inside?? - Rennlist - Porsche Discussion Forums



OK, anyone here who want's to see what the OEM exhaust really looks like inside??

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Old 11-11-2011, 07:06 AM   #1
pete95zhn
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Default OK, anyone here who want's to see what the OEM exhaust really looks like inside??

...I guessed so...

Well, I have this de-cat scrap exhaust and I was slightly bored today, so I got my angle grinder and ooops...:
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Old 11-11-2011, 07:42 AM   #2
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nice... next time you get bored would you mind doing the same with the transmission? I want to see how it looks inside too...
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Old 11-11-2011, 08:25 AM   #3
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Thanks for posting this. Not much in there but it does quiet the sound, a little too much.
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Old 11-11-2011, 09:31 AM   #4
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Thanx for posting these. So when one does the hole-in-the-stock-exhaust-pipe mod for achieving a better, throatier sound, does it retard acceleration? How do aftermarket exhausts for the 996TT add HP? I'm not looking for the scientific answer. I'm just vaguely curious.

THanx.
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Old 11-11-2011, 10:04 AM   #5
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Interesting, thanks for the pics... amazing how quiet these cars are....
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Old 11-11-2011, 11:04 AM   #6
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Quote:
Originally Posted by GaFFLe View Post
How do aftermarket exhausts for the 996TT add HP? I'm not looking for the scientific answer. I'm just vaguely curious.

THanx.
I can't give you a scientific answer, just a guessimate, but if you look closely the pictures you'll notice that there's not much direct flow through the muffler part. Change to slightly bigger ( in pipe diameter ) flow-through muffler and the back-pressure will be greatly reduced.
Also in OEM exhaust there's two dense cats ( 400 cpi or more ) each side, and that "Pack-Man" style opening from the aft one is not very big...

I really do not know how for example RUF ( or PBK ) has done their mod, but after opening this one I'd say that the Pack-Men are gone and those partially closed pipe ends are opened.
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Old 11-11-2011, 11:54 AM   #7
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Thanks for posting these pics. What is the steel-wool looking stuff? Any idea what it's function is?
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Old 11-11-2011, 12:29 PM   #8
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Thanks for posting these pics. What is the steel-wool looking stuff? Any idea what it's function is?
That's the silencing stuff inside the silencer... There's actually two different styles of that inside. Just around those perforated pipes is an about 5mm thick layer of thread made out of S/S. I guess it's there to keep the actual silencing stuff ( which looks awfully lot like thick mineral insulation wool ) out of contact with exhaust flow and thus not to escape out of the silencer.
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Old 11-11-2011, 02:10 PM   #9
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Quote:
Originally Posted by GaFFLe View Post
Thanx for posting these. So when one does the hole-in-the-stock-exhaust-pipe mod for achieving a better, throatier sound, does it retard acceleration? How do aftermarket exhausts for the 996TT add HP? I'm not looking for the scientific answer. I'm just vaguely curious.

THanx.
Can't help you with the hole in the exhaust pipe mod question. (Part of me believes this 'mod' is favored by those owners who can't figure out a way to attach cards to their car so as to slap against the spokes of the wheels.)

Generally if an aftermarket exhaust truly adds HP it does so by allowing the engine to flow more air. The engine is an air pump and the amount of power it can generate depends upon how much air it can pump in a given amount of time.

This requires of course that the stock system be overly restrictive to begin with and that other areas of the engine, the intake system mainly, does not then become the limiting factor. IOWs, a freer flowing exhaust ain't going to help much if the engine can't bring in more air through its intake system.

Sincerely,

Macster.
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Old 11-11-2011, 05:25 PM   #10
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Turbo motors benefit from as little backpressure as possible... the stock exhaust trades higher backpressure for lower decibels. Aftermarket exhausts do the opposite, for greater responsiveness/spool and output.

The intake side of a well-engineered forced induction motor configuration rarely is a limiting factor, IMHO. At least, no where near as much as the exhaust side.
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Old 11-11-2011, 06:16 PM   #11
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Quote:
Originally Posted by GaFFLe View Post
So when one does the hole-in-the-stock-exhaust-pipe mod for achieving a better, throatier sound, does it retard acceleration?
All you ever wanted to know about the drilling out mod. I did it when I had a stock exhaust and loved it! When I put the cards in my wheels the rotors keep lighting them on fire under hard braking - can't figure that one out yet...

http://www.6speedonline.com/forums/9...ler-996tt.html
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Old 11-11-2011, 06:45 PM   #12
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Cool. From the J of the TJW mod, this is cool stuff. You should post the photos in the 6so thread for completeness sake. I could if you allow me to do so.


Jeff
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Old 11-11-2011, 08:06 PM   #13
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Quote:
Originally Posted by Macster View Post
Can't help you with the hole in the exhaust pipe mod question. (Part of me believes this 'mod' is favored by those owners who can't figure out a way to attach cards to their car so as to slap against the spokes of the wheels.)...

Sincerely,

Macster.
LOL, fuNNy you are. So yeah, I'm one of mod-owners and boy, that well placed hole in the pipe makes the stock exhaust SING quite nicely; however, I do notice that in high-speed acceleration, my car doesn't pull as hard as it use to. The diameter of the hole I cut was about 2" so maybe I'll try increasing it for giggles. The only reason I did the mod was for the sound and I figured I'd focus $3300+ dollars on something like turbos or an larger intercoolers, etc. Looks like I'm still gonna get an aftermarket exhaust unit after all.
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Old 11-11-2011, 09:21 PM   #14
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Thanks a lot! Great information....
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Old 11-12-2011, 12:01 AM   #15
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Quote:
Originally Posted by jcb-memphis View Post


Cool. From the J of the TJW mod, this is cool stuff. You should post the photos in the 6so thread for completeness sake. I could if you allow me to do so.


Jeff
Thanks Jeff! I've already done that^^
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