Swapping GT C diffusor to GT R diffusor

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Old 05-24-2021, 04:15 PM
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Old 05-24-2021, 06:05 PM
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I could just remove and install all day after this. Will it make car louder ?
Old 05-25-2021, 11:51 AM
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Originally Posted by mbjj57
Thank you! I had searched before but seems I missed it...
Old 05-25-2021, 12:17 PM
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Originally Posted by mbjj57
I guess I will have to remove the rear bumper then...
OK, removing the bumper is WAY trickier than that video. It shows you all of the fastening points BUT it misses a very critical disclaimer.

At the top clips on each side where it clips to the rear quarter, you need to use a tool. The tolerances to get into the gap to remove unlatch the clip is less than the thickness of a credit card. If you tug on it like the video suggests, you have about a 90% chance of tearing your bumper cover the way they explain it in the removal video below (I did). It's a very costly mistake - you might be able to get to it through removing the wheels and fender well, but I followed the video and....heartbreak. Ive removed a ton of bumper covers and never experienced this before - the video would have been accurate in all of those cases - its pretty standard. For the GT not so much. My body shop said the same thing when I came to them needing a new cover...its just that much harder to remove, and rewards you with a tear if you dont get it right.

Old 05-25-2021, 12:23 PM
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Originally Posted by Skilly
OK, removing the bumper is WAY trickier than that video. It shows you all of the fastening points BUT it misses a very critical disclaimer.

At the top clips on each side where it clips to the rear quarter, you need to use a tool. The tolerances to get into the gap to remove unlatch the clip is less than the thickness of a credit card. If you tug on it like the video suggests, you have about a 90% chance of tearing your bumper cover the way they explain it in the removal video below (I did). It's a very costly mistake - you might be able to get to it through removing the wheels and fender well, but I followed the video and....heartbreak. Ive removed a ton of bumper covers and never experienced this before - the video would have been accurate in all of those cases - its pretty standard. For the GT not so much. My body shop said the same thing when I came to them needing a new cover...its just that much harder to remove, and rewards you with a tear if you dont get it right.
This is 10000000000% true! Good call Skilly....now sell your damn Audi R8 and get back over here with us. We need you! That is why I asked for the pics/video/guidance. YOU WILL TEAR THE BUMPER ON REMOVAL. From what I know it's a nightmare to remove, not put on. It is a horrible design.
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Old 05-25-2021, 06:48 PM
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Originally Posted by Skilly
OK, removing the bumper is WAY trickier than that video. It shows you all of the fastening points BUT it misses a very critical disclaimer.

At the top clips on each side where it clips to the rear quarter, you need to use a tool. The tolerances to get into the gap to remove unlatch the clip is less than the thickness of a credit card. If you tug on it like the video suggests, you have about a 90% chance of tearing your bumper cover the way they explain it in the removal video below (I did). It's a very costly mistake - you might be able to get to it through removing the wheels and fender well, but I followed the video and....heartbreak. Ive removed a ton of bumper covers and never experienced this before - the video would have been accurate in all of those cases - its pretty standard. For the GT not so much. My body shop said the same thing when I came to them needing a new cover...its just that much harder to remove, and rewards you with a tear if you dont get it right.
I see... nothing is ever easy lol

The tail lights don't have to be removed though , correct?
Old 05-25-2021, 07:13 PM
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Originally Posted by mbjj57
I see... nothing is ever easy lol

The tail lights don't have to be removed though , correct?
correct
Old 05-25-2021, 09:17 PM
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Tail lights do have to be removed.
Old 05-25-2021, 09:24 PM
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Originally Posted by ZephyrAMG
Tail lights do have to be removed.
they don't in the video and they didnt with mine, even after the shop removed it correctly - lol. I don't think taking them out gives you better access...there aren't any clips under them. I guess it doesn't hurt, but I would focus on finding the tool to gain access to the clips.
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Old 01-31-2023, 11:33 AM
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After some search of affordable parts, I have the conversion to GTR rear now also made


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Old 01-31-2023, 11:40 AM
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did you also find he titanium exhaust for the center outlet, or is the center faux?
Old 01-31-2023, 11:45 AM
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I was waiting a long time for an affordable titanium exhaust (2750€) but yes..I've installed the titanium. Another option would be the attached one
Old 01-31-2023, 12:13 PM
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Originally Posted by xxxPaulxxx
I was waiting a long time for an affordable titanium exhaust (2750€) but yes..I've installed the titanium. Another option would be the attached one
don't know how that;s an option. Its a 3 opening exhaust....and far from cheap.

https://www.ebay.com/itm/15526793963...hoC8aMQAvD_BwE

Old 01-31-2023, 01:52 PM
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I agree with you, the normal GT R exhaust has 3 outputs, however, I know 2-3 GT Rs here who have rebuilt so, the car is also gets louder overall. For me, it would not need the 2 outputs on the sides
8100$ for a used exhaust is very expensive, as far as I found out, the exhaust here costs about that much new. That's why I say , I waited a while until I found one that fit the price.

But therefore... cheaper than buying a new exhaust would be
https://www.ebay.com/itm/27563239422...Bk9SR7jJ8ZLBYQ

Last edited by xxxPaulxxx; 01-31-2023 at 01:55 PM.
Old 02-01-2023, 02:17 AM
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this is a great thread guys

thks for all the advice and innovation!
Old 02-02-2023, 11:22 AM
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Originally Posted by xxxPaulxxx
I agree with you, the normal GT R exhaust has 3 outputs, however, I know 2-3 GT Rs here who have rebuilt so, the car is also gets louder overall. For me, it would not need the 2 outputs on the sides
8100$ for a used exhaust is very expensive, as far as I found out, the exhaust here costs about that much new. That's why I say , I waited a while until I found one that fit the price.

But therefore... cheaper than buying a new exhaust would be
https://www.ebay.com/itm/27563239422...Bk9SR7jJ8ZLBYQ
Funny enough, it's the muffler that ends up being the issue, not the entire exhaust. Even with tuners solutions, like Fi, the just provide new piping and config with the OEM muffler...which for the life of me other than eliminating the EVs, I have no idea why? It would be FAR less drama to simply add an EVM to get the same result. I also wonder what would be materially different from using your OEM muffler and fabricating the third opening to get the same results. The stock systems are great aside from the valves.

This mod is different of course, but for sound, the tinkering should be done up front with the downpipes or secondaries.
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Old 02-03-2023, 02:33 AM
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German exhaust company Capristo seems to be the only company which offers a complete exhaust system incl a new muffler
https://dein-sportauspuff.de/caprist...3req143ru67fv5
Old 02-07-2023, 02:38 AM
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Originally Posted by xxxPaulxxx
German exhaust company Capristo seems to be the only company which offers a complete exhaust system incl a new muffler
https://dein-sportauspuff.de/caprist...3req143ru67fv5

nicely done.

did you install the full amg gtr exhaust or just the rear titanium silcencer ?
Old 02-07-2023, 02:44 AM
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Installed the full gtr exhaust
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Old 05-15-2023, 07:45 AM
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too many...
Originally Posted by Skilly
OK, removing the bumper is WAY trickier than that video. It shows you all of the fastening points BUT it misses a very critical disclaimer.

At the top clips on each side where it clips to the rear quarter, you need to use a tool. The tolerances to get into the gap to remove unlatch the clip is less than the thickness of a credit card. If you tug on it like the video suggests, you have about a 90% chance of tearing your bumper cover the way they explain it in the removal video below (I did). It's a very costly mistake - you might be able to get to it through removing the wheels and fender well, but I followed the video and....heartbreak. Ive removed a ton of bumper covers and never experienced this before - the video would have been accurate in all of those cases - its pretty standard. For the GT not so much. My body shop said the same thing when I came to them needing a new cover...its just that much harder to remove, and rewards you with a tear if you dont get it right.
Any link to such tool? This is the only tool I find and don't think you would have the access for this, it’s more for use once bumper is removed. https://www.polyvance.com/Tab-Tools/

Last edited by dowheelies; 05-15-2023 at 08:25 AM. Reason: Added link

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