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Question re GT3 exhaust installation on a 964...

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Old 05-28-2018, 02:19 AM
  #46  
erikerik
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Trying to get what I paid for it at $1K +shipping. PM if you want it.
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Old 05-28-2018, 08:32 AM
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n1ne11
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Great job, looks incredibly good. We need some sound video now! Please!
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Old 05-29-2018, 12:05 PM
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Originally Posted by SR20Fastback
Just curious, but any actual power gains to be had with the GT3 setup? I’m guessing minimal if any, but every little bit helps.
I am not aware of any muffler that gives you any power gain (beside the +5hp of the stickers you put on the cars)
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Old 05-29-2018, 06:49 PM
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kos11-12
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ha ha well said !
regarding exhaust someone could spend weeks on a dino developing,
noise don't mean power, often damaging torque curve, been wear t shirt, hat and swimming wear :-((((
So far I guess the winners are decat, second muffler delete with Gpipe, possibly with a better after market primary muffler.
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Old 05-29-2018, 07:55 PM
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SR20Fastback
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Originally Posted by The Italian Pursuit
I am not aware of any muffler that gives you any power gain (beside the +5hp of the stickers you put on the cars)

Hah, well stickers ALWAYS give you that extra edge. I guess internally I’m just kicking around the idea of a GT3 setup vs the brombacher/m&m exhaust. Both sound good, though I imagine the m&m is one of the few setups that makes extra power.


That said the price delta if you want to keep heat is pretty terrible.
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Old 05-29-2018, 08:13 PM
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Originally Posted by n1ne11
Great job, looks incredibly good. We need some sound video now! Please!

Here you go. My car has B&B headers, into the loud outlet with the quiet outlets capped. It howls, I get lots of compliments on track. FYI, in this configuration at NCM, it registered 103.5db @ 50 feet (that’s loud).

Startup:
Exterior Mic:
Interior (on track @ VIR with remote mic behind the parcel shelf):
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Old 05-29-2018, 08:24 PM
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JasonAndreas
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Originally Posted by The Italian Pursuit
I am not aware of any muffler that gives you any power gain (beside the +5hp of the stickers you put on the cars)
Porsche Motorsports did see an increase with the GT3 muffler so they used it on the cup (they were surprised too). I don't remember the exact issue of Racecar Engineering but it was the issue that covered the last mezger 991 cup.
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Old 05-30-2018, 12:46 PM
  #53  
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If you are in CA and looking for GT3 muffler - price seems decent

https://sfbay.craigslist.org/sby/pts...573848506.html

https://sfbay.craigslist.org/sby/pts...573852541.html
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Old 05-30-2018, 06:40 PM
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Originally Posted by JasonAndreas
Porsche Motorsports did see an increase with the GT3 muffler so they used it on the cup (they were surprised too). I don't remember the exact issue of Racecar Engineering but it was the issue that covered the last mezger 991 cup.
intersting info, how does it compare to a 964 engine, the heads and cams will be different, no ?
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Old 06-01-2018, 11:30 AM
  #55  
964George
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Originally Posted by spartansix
Where did you source the blanked cutout?
My body shop did the blank out, mesh welded a piece from an old bumper then blended it to look OEM, any good body shop should be able to do the same.

Originally Posted by Santa Cruz Red
George... excellent work, looks great. Did you end up splitting the in-flow to the muffler between the "loud" inlet and the "quiet" inlet"... or did you just stay with the "loud"?
Still just using the LOUD option, on the fence over combining the quiet inlet... This is a quote from my missus on the current option "We're never going to talk in the car again, are we!"

Originally Posted by SR20Fastback
Just curious, but any actual power gains to be had with the GT3 setup? I’m guessing minimal if any, but every little bit helps.
Can't comment on any power gains but it definitely feels like it revs more freely, accidently hit the rev limiter a couple of times
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Old 06-01-2018, 01:43 PM
  #56  
964George
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Originally Posted by kos11-12
ha ha well said !
regarding exhaust someone could spend weeks on a dino developing,
noise don't mean power, often damaging torque curve, been wear t shirt, hat and swimming wear :-((((
So far I guess the winners are decat, second muffler delete with Gpipe, possibly with a better after market primary muffler.
Sounds about right to me (no pun intended), it's been well documented that the standard setup is pretty much spot on apart from the CAT delete releasing maybe 1HP
You just move the torque curve about and change the exhaust note depending on your choice of CUP pipe or G pipe.
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Old 06-01-2018, 01:59 PM
  #57  
964George
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Originally Posted by n1ne11
Great job, looks incredibly good. We need some sound video now! Please!
For some reason my iPad won't allow me to attach a video

Originally Posted by provoste
Here you go. My car has B&B headers, into the loud outlet with the quiet outlets capped. It howls, I get lots of compliments on track. FYI, in this configuration at NCM, it registered 103.5db @ 50 feet (that’s loud).

Startup:
https://youtu.be/bcGwpRAQXhk
Exterior Mic:
https://youtu.be/DtCAADAjEEI
Interior (on track @ VIR with remote mic behind the parcel shelf):
https://youtu.be/8HNwCLtsKtY
Thanks for adding, got to say, sounds amazing
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Old 06-01-2018, 02:03 PM
  #58  
HDA
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From what I learned the power to be made is 80% from getting better headers.

the 20% is between headers, from George's euros to S-car-go.
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Old 06-06-2018, 05:06 PM
  #59  
HDA
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this muffler seems to hang much lower than George's?

https://youtu.be/dTPJM5ZVSlQ
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Old 09-19-2018, 03:07 AM
  #60  
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Great write up. I am in the process of getting mine installed.
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