Catless zl1 worth it ??

Jsuper392 · 05-12-2023, 05:51 PM

Tuning my ZL1 and going flex fuel. Tuner doesn’t recommend going catless or getting headers for my set up. But I thought just going catless you’d gain hp?

JSH · 05-12-2023, 05:56 PM

Mine has headers, straight pipes, crimp delete, Kooks axle back with small mufflers, and no cats. It's loud, not a DD, and would not pass an emissions test

Joshinator99 · 05-12-2023, 06:02 PM

Quote:

Originally Posted by Jsuper392

Tuning my ZL1 and going flex fuel. Tuner doesn’t recommend going catless or getting headers for my set up. But I thought just going catless you’d gain hp?

If the car is mostly stock you’ll gain very little removing the cats. If you’re shooting for big power, then the gain goes up at that point. But even then, the Gen2 GESI cats cat support and survive very high HP.

Vigilante375 · 05-12-2023, 06:40 PM

I would say unless you're pushing 750rwhp or more, going catless is pointless.

But it's up to you. If you live in a State where you don't need to do smog testing then go catless.

Idaho2018GTPremium · 05-12-2023, 06:54 PM

For me personally the few hp gained going catless isn’t worth stinking like exhaust after a drive. So I vote no to going catless.

arpad_m · 05-12-2023, 07:27 PM

As stated above, the value proposition is very weak unless insane power is wanted.

IMO this is where one can decide not to be a dick and pollute for no good reason, whether or not inspections are a thing (the county I live in does not do any inspection, but I still have cats and don't intend to remove them). Live and let live.

Z OH 6 · 05-13-2023, 05:30 AM

Quote:

Originally Posted by Idaho2018GTPremium

For me personally the few hp gained going catless isn’t worth stinking like exhaust after a drive. So I vote no to going catless.

This!

Chrome383Z · 05-13-2023, 06:59 AM

CSP headers with GESI Gen 2 CATs. I’m putting down 650rwhp now, no issues and plan to bump that up to 850rwhp at some point and think these CATs will handle it. Tames the exhaust a little along with not smelling like crap. I’d recommend this route!

D3adch1ld · 05-14-2023, 05:42 PM

Quote:

Originally Posted by Jsuper392

Tuning my ZL1 and going flex fuel. Tuner doesn’t recommend going catless or getting headers for my set up. But I thought just going catless you’d gain hp?

Its more complex than that. The ECU protects the cats and will dump fuel to cool them and reduce timming at certain temps. If you only do hero pulls here and there. Keep them. If you put your car through its paces, its beneficial. HP Tuners should allow you to pass inspection if they dont do visual/sniffer test.

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D3adch1ld · 05-14-2023, 05:43 PM

Quote:

Originally Posted by Idaho2018GTPremium

For me personally the few hp gained going catless isn’t worth stinking like exhaust after a drive. So I vote no to going catless.

Sounds like you need a better tuner. Speak with Vengeance Racing.

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JSH · 05-14-2023, 06:00 PM

Quote:

Originally Posted by D3adch1ld

Sounds like you need a better tuner. Speak with Vengeance Racing.

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this ^^^

Sephx1 · 05-14-2023, 06:30 PM

Cats with delete pipes best of both worlds. Going back and forth several times now I can say it is definitely louder and smells more with cats off. Running 50% or more ethanol there isn’t a noticeable smell. With cats on definitely quieter and no smell on 91 octane pump fuel.

Tje66 · 05-14-2023, 06:45 PM

My zl1 is catless with 870whp on e85. When Hollywood stops flying around in Lear jets and Al Gore quits driving in a 7 suburban line of trucks. So he can tell me to drive a stupid ev around. I’ll keep my car catless and make killer power!

*radz28* · 05-15-2023, 08:44 AM

I believe his car IS tuned by Vengence...

05-12-2023, 05:51 PM	#1
Jsuper392 Drives: 21 camaro LT1 Join Date: Sep 2021 Location: Toledo Ohio Posts: 6	Catless zl1 worth it ?? Tuning my ZL1 and going flex fuel. Tuner doesn’t recommend going catless or getting headers for my set up. But I thought just going catless you’d gain hp?

05-12-2023, 05:56 PM	#2
JSH Drives: '20 ZLE Join Date: Jun 2020 Location: Mile High Posts: 3,614	Mine has headers, straight pipes, crimp delete, Kooks axle back with small mufflers, and no cats. It's loud, not a DD, and would not pass an emissions test __________________ '20 ZL1 1LE A10. LME 390, E2650, FBO, 100 oct. Not a DD. Last edited by JSH; 05-13-2023 at 08:06 AM.

05-12-2023, 06:54 PM	#5
Idaho2018GTPremium Drives: 2021 Camaro ZL1 A10 Join Date: Nov 2018 Location: Idaho Posts: 1,219	For me personally the few hp gained going catless isn’t worth stinking like exhaust after a drive. So I vote no to going catless. __________________ 2021 Camaro ZL1 A10 2022 GR Supra 3.0 Past: 2018 Mustang GT Premium w/ PP1, MR, and A10 2007 MazdaSpeed3 1995 Pontiac Trans Am 1987 Camaro Z28

05-12-2023, 07:27 PM	#6
arpad_m Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017 Location: East Tennessee Posts: 11,696 View My Garage	As stated above, the value proposition is very weak unless insane power is wanted. IMO this is where one can decide not to be a dick and pollute for no good reason, whether or not inspections are a thing (the county I live in does not do any inspection, but I still have cats and don't intend to remove them). Live and let live. __________________ 2018 Camaro 2SS — G7E MX0 NPP F55 IO6 735 rwhp \| 665 rwtq Magnuson TVS 2300 80mm pulley \| Kooks 1 7/8" LT headers \| JRE smooth idle terminator cam \| LT4 FS & injectors \| TSP forged pistons & rods JMS PowerMAX \| DSX flex fuel kit \| Roto-Fab CAI \| Soler 95mm LT5 TB \| 1LE wheels \| 1LE brakes \| BMR rear cradle lockout \| JRE custom tune 1100 - 1/30/18 \| 2000 - 1/31/18 3000 - 2/06/18 TPW 2/26/18 3400 - 2/19/18 \| 3800 - 2/26/18 4300 - 2/27/18 \| 4B00 - 3/01/18 4200 - 3/05/18 \| 4800 - 3/14/18 5000 - 3/16/18 \| 6000 - 3/19/18

05-13-2023, 06:59 AM	#8
Chrome383Z Drives: 2019 Camaro 2SS Join Date: Aug 2020 Location: McCordsville, Indiana Posts: 621	CSP headers with GESI Gen 2 CATs. I’m putting down 650rwhp now, no issues and plan to bump that up to 850rwhp at some point and think these CATs will handle it. Tames the exhaust a little along with not smelling like crap. I’d recommend this route! __________________ 2019 Shock 2SS A10. 2650@10psi/LPE HPFP/XDI+30/LT4 LPFP+JMS/Soler 95mm/Rotofab, E65, CSP 2” Headers/GESI GenII Cats. MM Wild/GM SG3 suspension/1LE Brakes, Velgen VF5 Wheels/GY SC3. JRE Tuned.

05-12-2023, 06:40 PM	#4
Vigilante375 Drives: 2018 Camaro ZL1 Join Date: Aug 2018 Location: Georgia Posts: 1,380	I would say unless you're pushing 750rwhp or more, going catless is pointless. But it's up to you. If you live in a State where you don't need to do smog testing then go catless.

05-14-2023, 06:30 PM	#12
Sephx1 Drives: 18 ZLE, 18 SS1LE, 16 SS, 23 ZL1 Join Date: Jan 2021 Location: Phoenix Arizona Posts: 421	Cats with delete pipes best of both worlds. Going back and forth several times now I can say it is definitely louder and smells more with cats off. Running 50% or more ethanol there isn’t a noticeable smell. With cats on definitely quieter and no smell on 91 octane pump fuel. Attached Images

05-14-2023, 06:45 PM	#13
Tje66 Drives: 2010 Camaro 2ss procharged Join Date: Apr 2015 Location: Hbg pa Posts: 84	To the worried one about the environment My zl1 is catless with 870whp on e85. When Hollywood stops flying around in Lear jets and Al Gore quits driving in a 7 suburban line of trucks. So he can tell me to drive a stupid ev around. I’ll keep my car catless and make killer power!

05-15-2023, 08:44 AM	#14
radz28 Petro-sexual Drives: Ultra-Grin Join Date: Oct 2006 Location: Crazy Coast Posts: 15,224 View My Garage	I believe his car IS tuned by Vengence... __________________ '20 ZL1 Black "Fury" A10, PDR, Exposed CF Extractor Magnuson Magnum DI TVS2650R // RFBG // Soler 103 // TooHighPSI Port Injection // THPSI Billet Lid // FF // Katech Drop-In // PLM Heat Exchanger // ZLE Cradle bushings // BMR Chassis-Suspension Stuff // aFe Bars // Diode Dynamics LEDs // ACS Composites Guards // CF Dash // Aeroforce // tint // other stuffs

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