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996 Turbo / GT2 Turbo discussion on previous model 2000-2005 Porsche 911 Twin Turbo and 911 GT2.
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Modified OEM Muffler 996TT

 
  #586  
Old 05-20-2016, 10:50 PM
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I know im kinda late to this DIY mod, but having completed it today I feel like I can contribute here.. this thread has a name, now it has a face.... here is my selfie with the two pucks I cut out today with a few 2" holes saws on my face. only ran the car for a minute on the jackstands & the improved idle sound is promising... will drive it in anger some tomorrow...
 
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  #587  
Old 04-24-2017, 11:39 AM
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Ancient thread bump!

Has anyone just gutted both cat's and nothing else? Drone?

Thanks!
 
  #588  
Old 05-10-2017, 01:40 PM
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I did it, zero drone - car picked up 8-10bhp.
 
  #589  
Old 06-24-2018, 05:00 PM
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Hello everyone, I am going to make this modification in my 996 TT, but I want to know which is the best hole diameter: 1 "1/3 - 1" 1/2 - 2 "... to get the best sound without losing that increase of 10-15 hp and 20-30 nm torque.

Thank you
 
  #590  
Old 06-25-2018, 05:13 AM
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Not sure it matters. I believe my hole saw was 1 1/4”. Sounds better, no drone.
 
  #591  
Old 06-25-2018, 07:43 AM
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Jeez, buy a muffler, don't put holes in the OE can.
 
  #592  
Old 06-25-2018, 03:52 PM
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I think you're in the wrong thread, this is to make the hole in the OEM exhaust.
 
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Old 06-25-2018, 05:21 PM
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Originally Posted by Manhattan View Post
I think you're in the wrong thread, this is to make the hole in the OEM exhaust.
Yes, I'm advising against it. Search ebay, there's cheap exhaust out there. Even those china made pipes are better than this idea. But if you must, use a stepped bit. That has all the size you need.
 
  #594  
Old 06-25-2018, 11:06 PM
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Why do not you advise? the sound is better and the dino tests give more hp and torque, the oem exhaust is a great escape, although heavy.

The next step would surely be to remove the catalysts from 400 cells.
 
  #595  
Old 06-26-2018, 01:43 AM
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Originally Posted by Manhattan View Post
Why do not you advise? the sound is better and the dino tests give more hp and torque, the oem exhaust is a great escape, although heavy.

The next step would surely be to remove the catalysts from 400 cells.
Really?? So i could drill a hole in my Europipe exhaust and get more hp and torque
What size was that drillbit again
 
  #596  
Old 06-26-2018, 01:11 PM
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Only for the OEM exahaust, not for europipe.
 
 
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