ZL1 exhaust/tune questions and opinions
 

Hi all. Proud new owner of a black 2019 ZL1. She's at the shop now getting ppf and window tint.

Looking at general ideas to get some more sound. I have a few questions..

I must pass emissions in my state. Will deleting 2nd cats hinder the emissions passing?

I'm leaning towards an x-pipe and axle backs. Will I be able to keep the functionality of the exhaust mode tone change?

Last but not least, what are my limitations for stock tune parameters.. I want to do exhaust, Cai, and probably a mild ported throttle body to help with the throttle respond. Would I be ok with all of these bolt ons?

Thanks
Ben

No tune needed for TB, CAI and Exhaust. If you delete PRIMARY cats and/or add Headers, then you will need a tune.

Any axle back is going to remove the OEM valved exhaust. However, there are some exhaust companies, namely Borla, that DO have valves on them and operate like stock. Namely Borla has this setup. Then go for a Roto-fab CAI and either a Katech or Tony Mamo TB and you'll be set.

No idea on the emissions in your state. Note that any cat-back exhaust that does not delete secondary cats will require you to cut the factory exhaust.

Give us a call @ the number below. We cans set you up on a great deal with something like Borla that keeps your NPP.

I put a TB, cold air, Borla Attack cat back exhaust , no check engine light and it runs great.
Best of all warranty is still good.

Great advice guys, thank you! Looking forward to getting some parts slapped on this beast!

I believe that the secondary cats are to meet CARB level emissions requirements.

CARB required states are CA, CT, DE, ME, MD, MA, NJ, and NM manufactured 2011 and later.
CARB (2016 and later) now also includes NY, OR, PA, RI, VT, WA and DC.

GA is non CARB. You SHOULD have no problem with emissions testing. I would however double check your state regs.

You will not need the secondary cats if you are in a county in Georgia that requires emissions testing. I live in Georgia.

My '18 ZL1 A10 has Rotofab Intake (normal, dry) and Borla S-Type Exhaust (complete from Secondary CATS/Resonators back). Awesome sound, retains sound Valves and no codes. Highly Recommended! Both adds appear to be excellent quality!

TB and CAI
 

I'm a fan of your YouTube videos. How about a deal on a TB and CAI?

Borla S-Stype is a factory option on many GM models. Best sounding exhaust & the NPP Active exhaust stays intact. It is not inexpensive by any means but you get what you pay for. I have a Ported T-Body, Roto-Fab CAI & the Borla exhaust. Car is fast as F.

I'm thinking of getting the Borla ATAK. I like that it'll have the exhaust valves. Told the wife I'd wait until next month since I'm getting the PS4S mounted tomorrow.

Sig...👀

Boys, gotta be honest, I just want the sound, requested below. I am a car person but clueless re: exhaust....deletes, and what to delete.....cat back vs axle back...Lost boy here.

I am in the look stage and so confused with so many options.
Personally, I had the Shelby gt350 and the OPEN exhaust was the tops!!!! I would love th get something like that. I am thinking Cat delete, or muffler delete or resonator delete.....something simple and easy that keeps the NPP working while still getting the deep throated sound. I want it noticeable and growling but not totally obnoxious

Borla S type cat-back.