2017/2018 ZL1. Removing back 2 cats

Tampabucs4 · 03-14-2018, 05:55 AM

Has anyone kept the stock exhaust but eliminated the back 2 cats? Is the sound increase worth it?

kwav8r · 03-14-2018, 06:07 AM

Post #38 and 39.

http://www.camaro6.com/forums/showth...+delete&page=3

Can'tHave2MuchHP · 03-14-2018, 10:41 AM

"Secondary cat delete" and yes. Pretty common. My buddy did it to his '17 ZL1 and I wouldn't say it increased much of anything, perhaps a little bark on startup and a little more rasp/volume everywhere else. I'd go for a full Cat-back or Axle-back + Borla 60606 X-Pipe if you want a full system, personally.

kwav8r · 03-15-2018, 02:56 PM

Installed the Borla 60606 this morning. Mated it to the OEM exhaust manifolds and OEM suitcase muffler.

Exhaust note is definitely a lot deeper/throatier and a little louder.

Overall, very happy with it!

ZED SLED · 03-15-2018, 03:04 PM

Quote:

Originally Posted by kwav8r

Installed the Borla 60606 this morning. Mated it to the OEM exhaust manifolds and OEM suitcase muffler.

Exhaust note is definitely a lot deeper/throatier and a little louder.

Overall, very happy with it!

Does it have any of that world famous Borla drone? My 2010 SS would drive you nuts around 1800-2000 rpm.

Can'tHave2MuchHP · 03-15-2018, 03:39 PM

Quote:

Originally Posted by ZED SLED

Does it have any of that world famous Borla drone? My 2010 SS would drive you nuts around 1800-2000 rpm.

Drone is usually going to be made or stopped in the muffler. He installed only an X pipe. The stock mufflers may be more drone prone than a Corsa system but likely zero drone even with 60606 + NPP. I’m going to be doing 60606 + Corsa Xtreme and will report when I do.

Tampabucs4 · 03-15-2018, 03:43 PM

Kwav was that Borla mid and xpipe bolt up or did you have to make it fit on the zl1

kwav8r · 03-15-2018, 03:51 PM

No drone whatsoever but you can tell the secondary cats have been removed (take that for what it's worth).

It was essentially bolt up but I did have to cut the OEM pipes forward of the OEM suitcase.

Others reported having to spread the 60606 at the ends to mate with the OEM pipe width coming out of the suitcase. I didn't have to do any of that. Inside to inside of the stock pipes was 29cm the 60606 was 28.5. These butt end clamps made the install a breeze: https://www.summitracing.com/parts/vpe-1176/overview/

Can'tHave2MuchHP · 03-15-2018, 03:51 PM

Quote:

Originally Posted by Tampabucs4

Kwav was that Borla mid and xpipe bolt up or did you have to make it fit on the zl1

The 60606 bolts to the primary cats but you must cut and clamp the rear just before the muffler. It also lines right up with the Corsa axle backs.

kwav8r · 03-15-2018, 03:52 PM

Quote:

Originally Posted by Can'tHave2MuchHP

Drone is usually going to be made or stopped in the muffler. He installed only an X pipe. The stock mufflers may be more drone prone than a Corsa system but likely zero drone even with 60606 + NPP. I’m going to be doing 60606 + Corsa Xtreme and will report when I do.

I do want to know what the Corsa Extreme sounds like, I may do an axle back in the future.

kwav8r · 03-15-2018, 03:53 PM

Quote:

Originally Posted by Can'tHave2MuchHP

The 60606 bolts to the primary cars but you must cut and clamp the rear just before the muffler. It also lines right up with the Corsa axle backs.

ninetres · 03-15-2018, 05:48 PM

Quote:

Originally Posted by kwav8r

I do want to know what the Corsa Extreme sounds like, I may do an axle back in the future.

My Zl1 has corsa xtreme axleback, custom 2.75” X pipe, and no secondary cats. Looks up my threads and you’ll find pics and a sound clip.

Kratos · 03-16-2018, 05:25 AM

Does the borla 60606 throw a code? Anyone have any experience with the Kooks high flow cat and if that throws a code? Do both of these just bolt on to the stock primary cat?

I'd rather get rid of both stock cats and have a single high flow cat. I'm looking for something that won't throw a code and will add noticeable volume.

kwav8r · 03-16-2018, 05:32 AM

Quote:

Originally Posted by Kratos

Does the borla 60606 throw a code? Anyone have any experience with the Kooks high flow cat and if that throws a code? Do both of these just bolt on to the stock primary cat?

I'd rather get rid of both stock cats and have a single high flow cat. I'm looking for something that won't throw a code and will add noticeable volume.

No codes with 60606, it bolts on downstream from the primary cats and O2 sensors, eliminates secondary cats.

03-14-2018, 05:55 AM	#1
Tampabucs4 Drives: 2018 blue ZL1 Join Date: Feb 2018 Location: Tampa Florida Posts: 98 View My Garage	2017/2018 ZL1. Removing back 2 cats Has anyone kept the stock exhaust but eliminated the back 2 cats? Is the sound increase worth it? __________________

03-15-2018, 03:43 PM	#7
Tampabucs4 Drives: 2018 blue ZL1 Join Date: Feb 2018 Location: Tampa Florida Posts: 98 View My Garage	Kwav was that Borla mid and xpipe bolt up or did you have to make it fit on the zl1 __________________

03-14-2018, 06:07 AM	#2
kwav8r Flyin NOE Drives: 2018 ZL1 (A10) Join Date: Apr 2017 Location: TX Posts: 949	Post #38 and 39. http://www.camaro6.com/forums/showth...+delete&page=3

03-14-2018, 10:41 AM	#3
Can'tHave2MuchHP Drives: Fast Join Date: Mar 2015 Location: Michigan Posts: 3,696	"Secondary cat delete" and yes. Pretty common. My buddy did it to his '17 ZL1 and I wouldn't say it increased much of anything, perhaps a little bark on startup and a little more rasp/volume everywhere else. I'd go for a full Cat-back or Axle-back + Borla 60606 X-Pipe if you want a full system, personally.

03-15-2018, 02:56 PM	#4
kwav8r Flyin NOE Drives: 2018 ZL1 (A10) Join Date: Apr 2017 Location: TX Posts: 949	Installed the Borla 60606 this morning. Mated it to the OEM exhaust manifolds and OEM suitcase muffler. Exhaust note is definitely a lot deeper/throatier and a little louder. Overall, very happy with it!

03-15-2018, 03:51 PM	#8
kwav8r Flyin NOE Drives: 2018 ZL1 (A10) Join Date: Apr 2017 Location: TX Posts: 949	No drone whatsoever but you can tell the secondary cats have been removed (take that for what it's worth). It was essentially bolt up but I did have to cut the OEM pipes forward of the OEM suitcase. Others reported having to spread the 60606 at the ends to mate with the OEM pipe width coming out of the suitcase. I didn't have to do any of that. Inside to inside of the stock pipes was 29cm the 60606 was 28.5. These butt end clamps made the install a breeze: https://www.summitracing.com/parts/vpe-1176/overview/

03-16-2018, 05:25 AM	#13
Kratos Drives: ZL1 1LE Join Date: Sep 2009 Location: CA Posts: 95	Does the borla 60606 throw a code? Anyone have any experience with the Kooks high flow cat and if that throws a code? Do both of these just bolt on to the stock primary cat? I'd rather get rid of both stock cats and have a single high flow cat. I'm looking for something that won't throw a code and will add noticeable volume.

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