High flow cats - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

DAnubs · 12-07-2020, 09:33 AM

Hey Guys!

So currently I'm running long tube headers with a 3 inch collector, then fitted with a catless test pipe, then 3in straight piped out to 4 inch tips.

Really would like to throw a emission legal set of high flow cats on it to make it more legal.

That being said, I've never personally used high flow cats. I would like something that's a 3 in od to 3 in id for my fitment that is at least 49 state legal.

So questions I have are

1: What do you guys run?
2: How does it effect performance?
3: Do high flows really quiet the car down like stock cats do?
4: Am I wasting my time and money?

Thanks in advance for all the coming advice!

TheFlyingBananaSS · 12-07-2020, 10:34 AM

H/F cats will quiet the car down, but not by much like a factory cat does.
I have stainless works 3 inch H/F cats but I really need to remove them or hollow them out before I melt them. Having a supercharger can cause a cat meltdown. Be careful if you're supercharged.

DAnubs · 12-07-2020, 12:07 PM

Forced induction isn't something I plan to do to this car. I'm okay with loosing some of the loudness, just would like to keep some rumble.

12-07-2020, 09:33 AM	#1
DAnubs Drives: 2010 Camaro 2SSRS Join Date: Sep 2020 Location: Ohio Posts: 29	High flow cats Hey Guys! So currently I'm running long tube headers with a 3 inch collector, then fitted with a catless test pipe, then 3in straight piped out to 4 inch tips. Really would like to throw a emission legal set of high flow cats on it to make it more legal. That being said, I've never personally used high flow cats. I would like something that's a 3 in od to 3 in id for my fitment that is at least 49 state legal. So questions I have are 1: What do you guys run? 2: How does it effect performance? 3: Do high flows really quiet the car down like stock cats do? 4: Am I wasting my time and money? Thanks in advance for all the coming advice!

12-07-2020, 10:34 AM	#2
TheFlyingBananaSS Evil Genius of Chevrolet Drives: 2017 Z06, 2019 XTS, 2013 SS Join Date: Feb 2017 Location: New York Posts: 3,260	H/F cats will quiet the car down, but not by much like a factory cat does. I have stainless works 3 inch H/F cats but I really need to remove them or hollow them out before I melt them. Having a supercharger can cause a cat meltdown. Be careful if you're supercharged. __________________ GPI SS2 VVT cam, ECS Novi 1500 supercharger, Corsa Extreme, Detroit Speed and BMR suspension, Circle D triple disc, Melling oil pump, LS2 chain tensioner, ATI 10% UD, DSX E85 kit, High Energy coils, BTR springs, LS2 Lifter trays, Titanium retainers, hardened push rods, FIC 1000 injectors, ZL1 pump, Mighty Mouse catch can, AEM gauges, Tial BOV, Richmond 3.91 gears, Custom gauge bezels, Speed Engineering headers, Stainless Works HF cats, DSX Aux pump, 710rwhp on E85.

12-07-2020, 12:07 PM	#3
DAnubs Drives: 2010 Camaro 2SSRS Join Date: Sep 2020 Location: Ohio Posts: 29	Forced induction isn't something I plan to do to this car. I'm okay with loosing some of the loudness, just would like to keep some rumble.