Borla secondary cat delete

Booher · 08-31-2018, 06:15 PM

Can someone give me some insight on these please. I just got my set in the mail and glancing over the instructions, there aren't any specific instruftions for this model # 60663. Is it just basically remove cross brace, hold these up, mark, and cut them? Or is there a certain measurement that I'm supposed to measure off of?

ssmike · 08-31-2018, 06:32 PM

Interested too. I’m looking at options for the cat delete and this seems the cheapest. Looks like cut the factory cat out and weld these in.

Booher · 08-31-2018, 06:33 PM

Also, what is the threaded hole for?

TMS · 08-31-2018, 06:33 PM

Quote:

Originally Posted by Booher

Can someone give me some insight on these please. I just got my set in the mail and glancing over the instructions, there aren't any specific instruftions for this model # 60663. Is it just basically remove cross brace, hold these up, mark, and cut them? Or is there a certain measurement that I'm supposed to measure off of?

It depends I think. They are designed to attach right behind the primary cats. As for the other end, if you are running the Borla Catback exhaust, then there should be no cutting. Those are designed for the Borla exhaust system. If you are fitting to your stock exhaust then I'm pretty sure you'll need to cut the stock exhaust and either weld or use coupling clamps to attach to your 60663 pipes.

TMS · 08-31-2018, 06:36 PM

Quote:

Originally Posted by Booher

Also, what is the threaded hole for?

The threaded hole is for the rear O2 sensor. On the driver side, the rear O2 sensor mounts behind the primary cat on the primary cat tail section so you don't have a threaded bung on the driver side delete pipe. Once you look at your stock exhaust secondary O2 sensor locations, it will make sense.

Booher · 08-31-2018, 06:49 PM

That was exactly the plan. I have sw axleback, everything else is stock. I bought a new flange gasket, this delete and two of those recommended clamps, that I'm anxiously awaiting. Ahhh ok, /phew, I was nervous I got a main cat delete or something haha, thankyou sir, now I can relax and wait for my clamps.

ssmike · 08-31-2018, 06:58 PM

Please let us know how the install goes and post pics. Thanks

Booher · 08-31-2018, 06:59 PM

Absolutely! Hopefully this weekend

Laststandard · 08-31-2018, 10:54 PM

Just got done installing the 60663 on my 1LE. Bit of a pain. Be prepared to pull the full exhaust. It was just easier that way.

The spot to cut the stock exhaust at lines up with some dimples put in from the factory. Makes it a pain to use an exhaust pipe cutter. Need to make sure the vibrant clamp ends up on a round part of the tube, otherwise it won't seal. May want to cut the stock exhaust on the long side (closer to the welded on brace) and trim to fit. It's a pain, but if you cut it too short there's nothing to do but weld or replace.

The factory clamp on the driver's side pipe is spot welded on. Borla instructions say to cut the tab and remove the clamp. Do that. I left it on and it doesn't seal up against the borla pipe.

A helper makes it much easier. The stock exhaust isn't light and it's a bit tough to manhandle around when you're underneath the car.

vaspen · 09-01-2018, 03:18 PM

So do these eliminate all 4 cats or just the rears

TMS · 09-01-2018, 04:14 PM

Just the rears.

vaspen · 09-01-2018, 07:23 PM

Sweet thats what I wanted to know

Ventmaster · 09-03-2018, 02:51 PM

OP, Chevy welded a little cross brace between the two stock pipes just about 26.5" back from where they mount to the primary cats.

Laststandard is talking about cutting your stock pipes long so you can trim your new 60663's just behind that (the brace) so you can have good round stock pipe to mate to your sleeve clamps and the Borla's.

With the help of a metal wormgear hose clamp for a guide, I've had good luck making straight cuts on these pipes with a cheap reciprocating saw and a high quality metal cutting blade while laying on my back under the car (use some eye protection please).

A Black&Decker Workmate does a perfect job of stabilizing a loose pipe like the 60663's for much easier square cutting with a wormgear clamp as well.

Good luck and remember- Have Fun!

Laststandard · 09-04-2018, 03:04 PM

Actually, I didn't trim the 60663's. I kept trimming back the stock pipes until the Borla's fit. Not a perfect fit on the clamps but I've put on about 150 miles and no o2 codes yet.

I didn't trust myself to not stab something under that car with a sawzall.. that's why I went with the exhaust pipe cutter.

08-31-2018, 06:15 PM	#1
Booher Drives: 2019 zl1 6 speed Join Date: Jul 2017 Location: Lake Havasu Arizona Posts: 1,135	Borla secondary cat delete Can someone give me some insight on these please. I just got my set in the mail and glancing over the instructions, there aren't any specific instruftions for this model # 60663. Is it just basically remove cross brace, hold these up, mark, and cut them? Or is there a certain measurement that I'm supposed to measure off of?

08-31-2018, 06:33 PM	#3
Booher Drives: 2019 zl1 6 speed Join Date: Jul 2017 Location: Lake Havasu Arizona Posts: 1,135	Also, what is the threaded hole for? Attached Images

08-31-2018, 10:54 PM	#9
Laststandard Drives: 2018 1SS 1LE Join Date: Apr 2018 Location: Mpls, MN Posts: 428	Just got done installing the 60663 on my 1LE. Bit of a pain. Be prepared to pull the full exhaust. It was just easier that way. The spot to cut the stock exhaust at lines up with some dimples put in from the factory. Makes it a pain to use an exhaust pipe cutter. Need to make sure the vibrant clamp ends up on a round part of the tube, otherwise it won't seal. May want to cut the stock exhaust on the long side (closer to the welded on brace) and trim to fit. It's a pain, but if you cut it too short there's nothing to do but weld or replace. The factory clamp on the driver's side pipe is spot welded on. Borla instructions say to cut the tab and remove the clamp. Do that. I left it on and it doesn't seal up against the borla pipe. A helper makes it much easier. The stock exhaust isn't light and it's a bit tough to manhandle around when you're underneath the car. __________________ 2018 1SS 1LE (sold)

09-01-2018, 04:14 PM	#11
TMS Drives: 2018 ZL1 1LE - HBM, PDR Join Date: Jun 2017 Location: Rescue, CA Posts: 324	Just the rears. __________________ JRE Tuned (HPTuners) \| 15% OD (9.17" crank pulley) \| TVS2300 Maggie Heartbeat Supercharger - 14 psi \| E-50 (DSX Flex Fuel kit) \| JMS FuelMax Fuel Pump Booster \| LPE Big Bore High Volume DI fuel pump \| LPE High Flow DI fuel injectors \| LT5 95mm TB \| RotoFab CAI \| AEM X-Series OBD2 wide band gauge \| Elite Engineering E2-X catch can \| Borla S-type NPP Cat-Back 3" exhaust \| Forgeline GTD1 5-lug Satin Graphite \| SunTek wrap \| C-Quartz Finest Reserve ceramic coated

09-04-2018, 03:04 PM	#14
Laststandard Drives: 2018 1SS 1LE Join Date: Apr 2018 Location: Mpls, MN Posts: 428	Actually, I didn't trim the 60663's. I kept trimming back the stock pipes until the Borla's fit. Not a perfect fit on the clamps but I've put on about 150 miles and no o2 codes yet. I didn't trust myself to not stab something under that car with a sawzall.. that's why I went with the exhaust pipe cutter. __________________ 2018 1SS 1LE (sold)

08-31-2018, 06:32 PM	#2
ssmike BL1ZZRD Drives: '16 Camaro 2SS, '20 Equinox Redline Join Date: Jul 2009 Location: Buffalo, NY Posts: 7,841	Interested too. I’m looking at options for the cat delete and this seems the cheapest. Looks like cut the factory cat out and weld these in.

08-31-2018, 06:49 PM	#6
Booher Drives: 2019 zl1 6 speed Join Date: Jul 2017 Location: Lake Havasu Arizona Posts: 1,135	That was exactly the plan. I have sw axleback, everything else is stock. I bought a new flange gasket, this delete and two of those recommended clamps, that I'm anxiously awaiting. Ahhh ok, /phew, I was nervous I got a main cat delete or something haha, thankyou sir, now I can relax and wait for my clamps.

08-31-2018, 06:58 PM	#7
ssmike BL1ZZRD Drives: '16 Camaro 2SS, '20 Equinox Redline Join Date: Jul 2009 Location: Buffalo, NY Posts: 7,841	Please let us know how the install goes and post pics. Thanks

08-31-2018, 06:59 PM	#8
Booher Drives: 2019 zl1 6 speed Join Date: Jul 2017 Location: Lake Havasu Arizona Posts: 1,135	Absolutely! Hopefully this weekend

09-01-2018, 03:18 PM	#10
vaspen Drives: 2017 l4 blue 6speed Join Date: Oct 2016 Location: p.a Posts: 199	So do these eliminate all 4 cats or just the rears

09-01-2018, 07:23 PM	#12
vaspen Drives: 2017 l4 blue 6speed Join Date: Oct 2016 Location: p.a Posts: 199	Sweet thats what I wanted to know

09-03-2018, 02:51 PM	#13
Ventmaster Drives: 2017 1SS 6spd Join Date: Jan 2011 Location: Utah Posts: 3,041	OP, Chevy welded a little cross brace between the two stock pipes just about 26.5" back from where they mount to the primary cats. Laststandard is talking about cutting your stock pipes long so you can trim your new 60663's just behind that (the brace) so you can have good round stock pipe to mate to your sleeve clamps and the Borla's. With the help of a metal wormgear hose clamp for a guide, I've had good luck making straight cuts on these pipes with a cheap reciprocating saw and a high quality metal cutting blade while laying on my back under the car (use some eye protection please). A Black&Decker Workmate does a perfect job of stabilizing a loose pipe like the 60663's for much easier square cutting with a wormgear clamp as well. Good luck and remember- Have Fun!

User Name		Remember Me?
Password