catted or no cats

Sooner Cole · 02-27-2018, 10:28 AM

Those of you with modded ZL1's and higher horsepower, did you go with high flow cats or no cats and why? The reason I ask is I have both recommendations and I am looking for advice or clarity from others. I am at 706 RWHP. Thanks!

Can'tHave2MuchHP · 02-27-2018, 10:40 AM

If you're going to go high flow, use Kooks Green Cats or GESI ones. They're mighty expensive though. I highly recommend just going catless. I mean what is there to gain by going high flows? They don't quiet the car down much if any. They don't stop much to any more smell. But they add the possibility of melting and ruining your exhaust system and again if you don't catch it, the heat from a plugged pipe and the back pressure could be catastrophic for several parts of your car.

TheElementalCashew · 02-27-2018, 11:07 AM

I went with Kooks green cats, but I’ve a bit less power than you. I did it to help with the smell and calm the rasp primarily.

WEAPON-X · 02-27-2018, 11:15 AM

Quote:

Originally Posted by 17ZL1Camaro

Those of you with modded ZL1's and higher horsepower, did you go with high flow cats or no cats and why? The reason I ask is I have both recommendations and I am looking for advice or clarity from others. I am at 706 RWHP. Thanks!

Kooks Green and done

https://weaponxmotorsports.com/colle...-gen-6-lt1-lt4

Sooner Cole · 02-27-2018, 12:35 PM

Quote:

Originally Posted by WEAPON-X

Kooks Green and done

https://weaponxmotorsports.com/colle...-gen-6-lt1-lt4

Appreciate your input. The question is, do I need cats at all? Is there any advantage to having cats? My state does not inspect for cats.

WEAPON-X · 02-27-2018, 12:38 PM

Quote:

Originally Posted by 17ZL1Camaro

Appreciate your input. The question is, do I need cats at all? Is there any advantage to having cats? My state does not inspect for cats.

Need? Depends on who you ask LOL. EPA says yes

Your nose might say yes if you're running 93 octane
Power numbers and wallet say no.

Who do you listen to?

shaffe · 02-27-2018, 12:44 PM

Quote:

Originally Posted by 17ZL1Camaro

Appreciate your input. The question is, do I need cats at all? Is there any advantage to having cats? My state does not inspect for cats.

The only advantage IMO is purely sound related. To me, depending on the set up a catted system can sound a bit more refined where as a catless system will sound more raw.

At the power level your going though I would probably ditch the cats especially if you don't need them to pass emissions

TDS · 02-27-2018, 02:33 PM

I went 2" headers, no cats, stock suitcase. I am at 649 RWHP right now but not done. Its LOUD and smells a little bit, AMEN!

soceur77 · 02-28-2018, 03:47 AM

can any of you guys that are running catless throw up some vids?

Evolvedx27 · 03-01-2018, 12:31 AM

Quote:

Originally Posted by soceur77

can any of you guys that are running catless throw up some vids?

+1

cann1x · 03-01-2018, 02:12 AM

https://www.instagram.com/p/BcVd8b1h...by=_joshua_az_

kooks longtubes 1 7/8 catless stock muffler

swizlstik · 03-01-2018, 12:02 PM

No cats, Kooks 1-7/8" headers, Borla S-type catback

Cmyskill · 03-19-2018, 08:47 PM

I am more worried about the smell of no cats... My old car if left it in the garage more than 15 seconds the wife would BITCH about how the house smelled like Gas. So I think I am going to look at the Kooks Green. I also was told that if I go with some E85 that it cleans up the gas smell quite a bit. I already have the E85 Sensor just need to have the car tuned for it. Also, Anyone know what makes the Kooks Green so much better than the other cats?

02-27-2018, 10:28 AM	#1
Sooner Cole Drives: 2019 ZL1-1LE A10 Join Date: Jan 2017 Location: Oklahoma Posts: 512	catted or no cats Those of you with modded ZL1's and higher horsepower, did you go with high flow cats or no cats and why? The reason I ask is I have both recommendations and I am looking for advice or clarity from others. I am at 706 RWHP. Thanks! __________________ 19 ZL1-1LE A10

02-27-2018, 11:07 AM	#3
TheElementalCashew Drives: 2017 ZL1 Join Date: Mar 2017 Location: NH Posts: 278	I went with Kooks green cats, but I’ve a bit less power than you. I did it to help with the smell and calm the rasp primarily. __________________ 2017 Camaro ZL1, Nightfall Gray Metallic: M6, PDR, exposed CF, navigation, sunroof Mods: Rotofab CAI, Tony Mamo TB, Kooks headers (green cats), 18% LPE lower pulley, E85/FlexFuel sensor. BC Forged RS41s (19x10, 19x12)/PS4S, R888R (305/325) Dyno: E40: 661whp/703wtq, 93: 633whp/674wtq

02-27-2018, 02:33 PM	#8
TDS Drives: 2019 Jeep Rubicon Sold:2017 ZL1 A10 Join Date: Feb 2017 Location: Scappoose, OR Posts: 560	I went 2" headers, no cats, stock suitcase. I am at 649 RWHP right now but not done. Its LOUD and smells a little bit, AMEN! __________________ Travis SOLD ZL1 Summit White, A10, Black Strip, PDR, ZL1 floor mats Ordered 2/11, 2000 2/14, 3000 2/20, 3100 2/24, 3300 3/7, 3400 3/8, 4300 3/16, 4B00 3/21 Bayed at train yard in Ohio, 4200 3/26 All Abroad for the West Coast, 4800 4/4 Deliverd to portland train yard, 5000 4/7 3:00AM Deliverd to Dealer, 6000 4/7 6:45PM Delivered to Customer

03-19-2018, 08:47 PM	#13
Cmyskill 17 ZL1 what a car.... Drives: 2021 M S PLAID, 2017 ZL1 A10 White Join Date: Apr 2008 Location: Port St Lucie FLORIDA Posts: 428	I am more worried about the smell of no cats... My old car if left it in the garage more than 15 seconds the wife would BITCH about how the house smelled like Gas. So I think I am going to look at the Kooks Green. I also was told that if I go with some E85 that it cleans up the gas smell quite a bit. I already have the E85 Sensor just need to have the car tuned for it. Also, Anyone know what makes the Kooks Green so much better than the other cats? __________________ 2017 ZL1 -- WHT - A10 - PDR - NAV Mods: Kooks 2", Lingenfelter 9.17” 18% Pulley, CAI, E85 sensor, and Interceptor Wide-band & Gauge with Pod, 180 Thermostat, BMR Rear suspension parts.

02-27-2018, 10:40 AM	#2
Can'tHave2MuchHP Drives: Fast Join Date: Mar 2015 Location: Michigan Posts: 3,696	If you're going to go high flow, use Kooks Green Cats or GESI ones. They're mighty expensive though. I highly recommend just going catless. I mean what is there to gain by going high flows? They don't quiet the car down much if any. They don't stop much to any more smell. But they add the possibility of melting and ruining your exhaust system and again if you don't catch it, the heat from a plugged pipe and the back pressure could be catastrophic for several parts of your car.

02-28-2018, 03:47 AM	#9
soceur77 Drives: 17 NFG ZL1 17 GTR 22 RS6 Join Date: Apr 2017 Location: Upper Marlboro MD Posts: 625	can any of you guys that are running catless throw up some vids?

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