Drive Cat less headers and no tune?

Pollock · 01-23-2023, 11:27 AM

Is it okay to temporarily drive a car with cat less headers. Need to get to the exhaust shop to fix the leaky ball and socket then to the tuner. I would baby the car.

I know you can do it with headers and green cats. Hopefully no different.

Thanks

musclesbmf · 01-23-2023, 11:36 AM

Yes, as long as you don't mind the light on the dash. Did it for several months until I did the rest of my mods and then did 1 final tune.

Mark

RobZL1 · 01-23-2023, 03:03 PM

Bear in mind it will likely set a permanent code, that is only reversible if you reinstall the stock stuff, or GESI cats while retaining the full functionality of the rear O2's.

Probably not an issue, but I think some states will ding you for the permanent code.

Joshinator99 · 01-23-2023, 04:25 PM

Quote:

Originally Posted by RobZL1

Bear in mind it will likely set a permanent code, that is only reversible if you reinstall the stock stuff, or GESI cats while retaining the full functionality of the rear O2's.

Probably not an issue, but I think some states will ding you for the permanent code.

Yep, this. You need to account for this equipment in the tune BEFORE you install it. Then you can have your tuner adjust the rest of it once the new equipment is installed.

Pollock · 01-23-2023, 05:16 PM

They don't test cars where I live. Not worried about it. Plus other than driving to a gas station from time to time, it's a track car.

RobZL1 · 01-23-2023, 06:21 PM

Then you're all good. Drive it to the tuner, no problem!

Pollock · 01-23-2023, 07:57 PM

Quote:

Originally Posted by RobZL1

Then you're all good. Drive it to the tuner, no problem!

I do not pay for On Star services. Never have with this car. They still sent me an email today saying my emissions need serviced.

Creepy at the same time.

arpad_m · 01-23-2023, 10:00 PM

Quote:

Originally Posted by Pollock

I do not pay for On Star services. Never have with this car. They still sent me an email today saying my emissions need serviced.

Creepy at the same time.

They Know (haunted castle music and sound fx in the background).

BTW I got multiple of these while my car was being worked on at Jannetty's, which was nice as as I knew when exactly they were done with reassembly and then testing

1sickzl1 · 01-24-2023, 03:28 PM

Quote:

Originally Posted by Joshinator99

Yep, this. You need to account for this equipment in the tune BEFORE you install it. Then you can have your tuner adjust the rest of it once the new equipment is installed.

I was just thinking about this last night lol. So you tune for it first then install the parts. Got it.

Joshinator99 · 01-24-2023, 05:33 PM

Quote:

Originally Posted by 1sickzl1

I was just thinking about this last night lol. So you tune for it first then install the parts. Got it.

Well you’re really just tweaking the anticipated trouble codes up front to prevent permanent codes. Then after the parts are installed, the actual “tuning” takes place.

01-23-2023, 11:27 AM	#1
Pollock LT4 M6 Drives: 2018 ZL1 1LE Join Date: Nov 2010 Location: Bloomington, IN Posts: 1,249	Drive Cat less headers and no tune? Is it okay to temporarily drive a car with cat less headers. Need to get to the exhaust shop to fix the leaky ball and socket then to the tuner. I would baby the car. I know you can do it with headers and green cats. Hopefully no different. Thanks

01-23-2023, 03:03 PM	#3
RobZL1 fo'shizZL1 Drives: 2017 ZL1 Join Date: Aug 2017 Location: ATL Posts: 1,281	Bear in mind it will likely set a permanent code, that is only reversible if you reinstall the stock stuff, or GESI cats while retaining the full functionality of the rear O2's. Probably not an issue, but I think some states will ding you for the permanent code. __________________ 2017 ZL1 M6 Black \| Maggie 2650 // 103TB // Big Gulp Past Rides- 2014 ZL1 M6 Red Hot \| Tons of mods 2004 CTS-V M6 Silver \| Many mods 1995 Corvette M6 Torch Red \| A few more mods 1992 Camaro M5 White \| A few mods

01-23-2023, 06:21 PM	#6
RobZL1 fo'shizZL1 Drives: 2017 ZL1 Join Date: Aug 2017 Location: ATL Posts: 1,281	Then you're all good. Drive it to the tuner, no problem! __________________ 2017 ZL1 M6 Black \| Maggie 2650 // 103TB // Big Gulp Past Rides- 2014 ZL1 M6 Red Hot \| Tons of mods 2004 CTS-V M6 Silver \| Many mods 1995 Corvette M6 Torch Red \| A few more mods 1992 Camaro M5 White \| A few mods

01-23-2023, 11:36 AM	#2
musclesbmf Drives: 2020 ZL1 1LE A10 Join Date: Feb 2021 Location: Lutz, FL Posts: 78	Yes, as long as you don't mind the light on the dash. Did it for several months until I did the rest of my mods and then did 1 final tune. Mark

01-23-2023, 05:16 PM	#5
Pollock LT4 M6 Drives: 2018 ZL1 1LE Join Date: Nov 2010 Location: Bloomington, IN Posts: 1,249	They don't test cars where I live. Not worried about it. Plus other than driving to a gas station from time to time, it's a track car.

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