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Old Feb 24, 2022 | 09:07 PM
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Default Sport cat install question

Has anyone been able to do it without dropping the exhaust or removing the headers? Working on getting my game plan together on what I'm in for. I already installed headers but would prefer to not remove them. Doing both at the same time sure would have been smart but alas here we are.
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Old Feb 25, 2022 | 12:00 AM
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I would assume you could without removing headers. Coupe or HTC ?
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Old Feb 25, 2022 | 02:21 AM
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There is no need to remove the headers.
You dont need to remove the exhaust but may need to unbolt the 2 rear hangers to be able to move it rearward enough to skip the cats in. Maybe not. I took mine off and never tried to get only cats out.
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Old Feb 25, 2022 | 06:08 AM
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Originally Posted by c7steve
I would assume you could without removing headers. Coupe or HTC ?
Coupe
Originally Posted by GTUnit
There is no need to remove the headers.
You dont need to remove the exhaust but may need to unbolt the 2 rear hangers to be able to move it rearward enough to skip the cats in. Maybe not. I took mine off and never tried to get only cats out.
Thank you.
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Old Feb 25, 2022 | 08:50 AM
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To make the install a little easier once the factory cats are out, maybe I should consider bolts rather than the factory-style included studs + nuts?
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Old Feb 25, 2022 | 09:39 AM
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nice install video from paragon

https://www.paragonperf.com/paragon-...port-cats.html
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Old Feb 25, 2022 | 10:00 AM
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Originally Posted by c7steve
Thanks. Paragon does a great job with their videos. Their video assumes the catback is removed but they did confirm by email that it's possible to leave the catback in place, its just a PITA and you need to push it down and away. It's the studs in the cats that make this R&R a bear! Really thinking I'm going to go get a bunch of stainless steel bolts to use for the high-flow sport cat install rather than using studs & nuts.
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Old Feb 25, 2022 | 05:08 PM
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Do you know how the studs are installed? If they are just press fit like wheel studs, you might be able to just press them out...or hammer them out.
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Old Feb 25, 2022 | 06:18 PM
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Originally Posted by SECLT22021
Do you know how the studs are installed? If they are just press fit like wheel studs, you might be able to just press them out...or hammer them out.
They're screw in type, similar to a head or manifold stud, but smaller. I may run to Home Depot or Lowe's to check our their selection of 10.9 hardware. Or maybe go try a real hardware store like ACE?
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Old Feb 25, 2022 | 10:22 PM
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The studs are threaded on both ends. Interference fit on the base end.
A normal bolt is not a good idea. You need a locking feature of some sort. A normal bolt will come loose.
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Old Feb 25, 2022 | 10:24 PM
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Originally Posted by GTUnit
The studs are threaded on both ends. Interference fit on the base end.
A normal bolt is not a good idea. You need a locking feature of some sort. A normal bolt will come loose.
Thank you. I'm probably overthinking it and will just install with the hardware provided once they're back from the coater. I'm having them done to match the headers.


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Old Feb 26, 2022 | 11:05 AM
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You can gain access to the cats from the trunk
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Old Feb 26, 2022 | 11:27 AM
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Originally Posted by iwantaz06now
You can gain access to the cats from the trunk
is there a video showing that?
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Old Feb 26, 2022 | 11:32 AM
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Originally Posted by SECLT22021
is there a video showing that?
Paragon's video above shows it, but when you remove the trunk access panel to replace the air filter or intake system you have pretty good access.




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Old Feb 26, 2022 | 11:34 AM
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Originally Posted by SECLT22021
is there a video showing that?
I would look at the instructions to install a c8 intake like from corsa. It's like 14 hex screws in the trunk and voila...access to the cats
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Old Feb 26, 2022 | 11:38 AM
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Originally Posted by iwantaz06now
I would look at the instructions to install a c8 intake like from corsa. It's like 14 hex screws in the trunk and voila...access to the cats
Yup, Corsa & especially AFE has mega detailed intake install instructions. See attached documents and below video:

Attached Images
File Type: pdf
57-10013r_ins_1.pdf (5.24 MB, 141 views)
File Type: pdf
INS44003.pdf (5.45 MB, 312 views)
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Old Feb 26, 2022 | 11:43 AM
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I'll be installing my intake as soon as it arrives (been sitting at a FedEx facility for a few days now), was hoping to do it today or tomorrow. Once I do I'll report back with my findings and more pictures.
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Old Sep 23, 2022 | 12:42 AM
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@Kracka were you able to install the Corsa Sport Cats without having to loosen the cat-back exhaust system? Just wondering how much PITA it was to replace the OEM cats with the OEM exhaust still in place. Thanks.
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Old Sep 23, 2022 | 07:21 AM
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Originally Posted by avigar
@Kracka were you able to install the Corsa Sport Cats without having to loosen the cat-back exhaust system? Just wondering how much PITA it was to replace the OEM cats with the OEM exhaust still in place. Thanks.
After installing my aFe intake I actually just had the cats installed by a shop. I was running low on spare time and figured I'd let them do it one day while I was at work.
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Old Sep 26, 2022 | 05:21 PM
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Originally Posted by avigar
@Kracka were you able to install the Corsa Sport Cats without having to loosen the cat-back exhaust system? Just wondering how much PITA it was to replace the OEM cats with the OEM exhaust still in place. Thanks.
You can't install the cats without removing them from the cat back. It's an incredible pain in the *** of a job. Not only are several of the bolts near-impossible to get to (especially the passenger side bottom), but they are super torqued on and will likely bend/break trying to break lose. Even the airbox is a pain to get out, and you *will* break clips. Would not recommend trying it yourself unless you want to spend 3 days and several busted knuckles doing it.
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