Debating swapping my HF cats for no cats - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

E.T. · 06-09-2023, 10:04 AM

Been thinking about this, but not sure. I have some straight pipes just lying around that I had on the car briefly in the past. I have a SOLO exhaust, which can be loud, but not super loud at idle. I wouldn't mind more volume. Also have LT headers, cam, blower, etc. Making about 600 rwhp. I've had the HF cats on for a while, so not sure what condition they're in on the inside.

I live in OH and have Collector's plates, so no e-check needed, ever. I barely drive the car, so not really worried about noise on long trips or anything like that. Basically, just want it to sound as bad ass as possible.

*edit* Actually, I don't have the catless midpipes anymore. I guess I'd have to buy some. If I decide to, what are the best options? I have Dynatech LT headers, so not sure if I should stick with the Dynatech brand. I want something I can just bolt on.

RupertPupkin · 06-09-2023, 10:54 PM

Run it. Besides the smell, and possibly making your exhaust sound raspy, other than that no other downside.

E.T. · 06-09-2023, 11:15 PM

Quote:

Originally Posted by RupertPupkin

Run it. Besides the smell, and possibly making your exhaust sound raspy, other than that no other downside.

Should I get the Dynatech tubes to match my headers? They make a pretty nice kit, but not sure if there are other options.

RupertPupkin · 06-10-2023, 07:55 PM

There's TSp faux cats. No idea if they'll fit.

morepowerjoe · 06-11-2023, 01:36 AM

I hadn't heard of Dynatech stuff before so I did a search on it and they look like they make pretty good stuff. At first I thought you were referring to Dynomax and I really like their stuff. Are your headers a slip fit connection?

morepowerjoe · 06-11-2023, 01:50 AM

I have seen these. But I'm not completely sure they are 3". I'm just assuming that you have a 3" exhaust.

https://www.texas-speed.com/p-15421-...e-headers.aspx

E.T. · 06-11-2023, 11:03 AM

These are the pipes that fit with my headers (2.5"). Unfortunately, it looks like they have been discontinued, and no one seems to have them in stock. I emailed Dynatech to see what they say. Originally, I put their high flow cats on when I got their headers. Later on, they came out with powermaxx cats, which are supposed to be for supercharged cars, and that's what I have on there now.

https://prankster87.com/product/non-...-10-14-camaro/

I actually still have the original high flow cats, and I supposed I could gut those, and put 'em back on, but not sure how much of a pain that is.

CamaroCracka · 06-13-2023, 07:22 AM

Lot of manufacturers stopped making the catless "off-road" pipes because the EPA started crawling up their backside.

morepowerjoe · 06-13-2023, 08:14 AM

You could use something like this with your old connector flanges and a little extension pipe. https://www.summitracing.com/parts/hed-21115

E.T. · 06-21-2023, 02:01 PM

Quote:

Originally Posted by CamaroCracka

Lot of manufacturers stopped making the catless "off-road" pipes because the EPA started crawling up their backside.

Yeah, I did confirm with Dynatech that they are discontinued. I'm sure I could get a shop to fit some straight pipes in there, but I will probably just leave well enough alone.

BiggFoot · 07-04-2023, 07:22 AM

Your sig states Magnuson so what psi are you running? If over 8 psi any cat is at risk of blow-out which could lodge downstream, inadvertently shut-off your exhaust flow, and cause nasty things to happen. I would just gut the cats and keep on rolling.

FasNuf · 07-04-2023, 08:06 AM

This probably won't help you, but at least it's info.

I went catless when I installed the Speed Engineering headers with their offroad pipe. I have NPP exhaust and almost never run it open because at WOT it's really raspy and obnoxiously loud. Headers, no cats and a muffler is just right for me. I get tired of the exhaust smell constantly. The only thing that seems to really help that is running E85.

06-09-2023, 10:04 AM	#1
E.T. Drives: 2012 Camaro 2SS/RS Join Date: Jul 2010 Location: Cleveland, OH Posts: 3,267	Debating swapping my HF cats for no cats Been thinking about this, but not sure. I have some straight pipes just lying around that I had on the car briefly in the past. I have a SOLO exhaust, which can be loud, but not super loud at idle. I wouldn't mind more volume. Also have LT headers, cam, blower, etc. Making about 600 rwhp. I've had the HF cats on for a while, so not sure what condition they're in on the inside. I live in OH and have Collector's plates, so no e-check needed, ever. I barely drive the car, so not really worried about noise on long trips or anything like that. Basically, just want it to sound as bad ass as possible. edit Actually, I don't have the catless midpipes anymore. I guess I'd have to buy some. If I decide to, what are the best options? I have Dynatech LT headers, so not sure if I should stick with the Dynatech brand. I want something I can just bolt on. __________________ Last edited by E.T.; 06-09-2023 at 10:26 AM.

06-09-2023, 10:54 PM	#2
RupertPupkin Drives: 2014 Camaro SS 1Le Join Date: Feb 2016 Location: IL Posts: 1,606	Run it. Besides the smell, and possibly making your exhaust sound raspy, other than that no other downside. __________________ 2014 SS 1LE Money Pit/ Forged 402 CAM 22X/24X, .619/.617, 113 LSA/ LS9 Heads FIC 1200cc/DSX Aux Pump//McLeod RXT Clutch 730whp: 630Trq

06-10-2023, 07:55 PM	#4
RupertPupkin Drives: 2014 Camaro SS 1Le Join Date: Feb 2016 Location: IL Posts: 1,606	There's TSp faux cats. No idea if they'll fit. __________________ 2014 SS 1LE Money Pit/ Forged 402 CAM 22X/24X, .619/.617, 113 LSA/ LS9 Heads FIC 1200cc/DSX Aux Pump//McLeod RXT Clutch 730whp: 630Trq

06-11-2023, 01:36 AM	#5
morepowerjoe Drives: 2012 Chevrolet Camaro l99 Join Date: Aug 2020 Location: Austin, TX Posts: 2,109	I hadn't heard of Dynatech stuff before so I did a search on it and they look like they make pretty good stuff. At first I thought you were referring to Dynomax and I really like their stuff. Are your headers a slip fit connection? __________________ DSS FX Forged Pistons, Eagle ESP L19 Forged Rods, ARP Head and Main Studs, TSP PRC 260 CNC Ported Heads milled .030, Cometic .040 Head Gaskets, GPI SS3 VVT Camshaft, GM Performance Racing Lifters, CHE Trunnions , Molly Pushrods, Melling 10355HV Oil Pump, Cold Air Inductions CAI, Fast LSXR Intake Manifold, Nick Williams 103 TB, TSP 1 7/8" Longtubes with 3" TSP Exhaust, ZL1 Fuel Pump, Mishimoto Radiator, Mishimoto Oil Cooler, Tru Cool 40k Tranny Cooler, 3600 Circle D Converter, Fluid Dynamics Balancer Build Thread https://www.camaro5.com/forums/showthread.php?t=609817

06-11-2023, 01:50 AM	#6
morepowerjoe Drives: 2012 Chevrolet Camaro l99 Join Date: Aug 2020 Location: Austin, TX Posts: 2,109	I have seen these. But I'm not completely sure they are 3". I'm just assuming that you have a 3" exhaust. https://www.texas-speed.com/p-15421-...e-headers.aspx __________________ DSS FX Forged Pistons, Eagle ESP L19 Forged Rods, ARP Head and Main Studs, TSP PRC 260 CNC Ported Heads milled .030, Cometic .040 Head Gaskets, GPI SS3 VVT Camshaft, GM Performance Racing Lifters, CHE Trunnions , Molly Pushrods, Melling 10355HV Oil Pump, Cold Air Inductions CAI, Fast LSXR Intake Manifold, Nick Williams 103 TB, TSP 1 7/8" Longtubes with 3" TSP Exhaust, ZL1 Fuel Pump, Mishimoto Radiator, Mishimoto Oil Cooler, Tru Cool 40k Tranny Cooler, 3600 Circle D Converter, Fluid Dynamics Balancer Build Thread https://www.camaro5.com/forums/showthread.php?t=609817

06-11-2023, 11:03 AM	#7
E.T. Drives: 2012 Camaro 2SS/RS Join Date: Jul 2010 Location: Cleveland, OH Posts: 3,267	These are the pipes that fit with my headers (2.5"). Unfortunately, it looks like they have been discontinued, and no one seems to have them in stock. I emailed Dynatech to see what they say. Originally, I put their high flow cats on when I got their headers. Later on, they came out with powermaxx cats, which are supposed to be for supercharged cars, and that's what I have on there now. https://prankster87.com/product/non-...-10-14-camaro/ I actually still have the original high flow cats, and I supposed I could gut those, and put 'em back on, but not sure how much of a pain that is. __________________

06-13-2023, 07:22 AM	#8
CamaroCracka Drives: 2010 Turbo LS3 Join Date: Dec 2009 Location: Palm Bay, FL Posts: 2,736	Lot of manufacturers stopped making the catless "off-road" pipes because the EPA started crawling up their backside. __________________ 2010 SS - On3 kit with downpipe cutout, CTR 78/80, CompCam 239/251 620/632 122+4, E85, Z28 suspension and ZL1 diff with Outlaw axles. Gen6 ZL1/1LE brakes. 2011 Vert - 416/w 230/236 .612/.602 115lsa, 1LE suspension w/32mm rear bar. Z28 diff. ZL1 brakes.

06-13-2023, 08:14 AM	#9
morepowerjoe Drives: 2012 Chevrolet Camaro l99 Join Date: Aug 2020 Location: Austin, TX Posts: 2,109	You could use something like this with your old connector flanges and a little extension pipe. https://www.summitracing.com/parts/hed-21115 __________________ DSS FX Forged Pistons, Eagle ESP L19 Forged Rods, ARP Head and Main Studs, TSP PRC 260 CNC Ported Heads milled .030, Cometic .040 Head Gaskets, GPI SS3 VVT Camshaft, GM Performance Racing Lifters, CHE Trunnions , Molly Pushrods, Melling 10355HV Oil Pump, Cold Air Inductions CAI, Fast LSXR Intake Manifold, Nick Williams 103 TB, TSP 1 7/8" Longtubes with 3" TSP Exhaust, ZL1 Fuel Pump, Mishimoto Radiator, Mishimoto Oil Cooler, Tru Cool 40k Tranny Cooler, 3600 Circle D Converter, Fluid Dynamics Balancer Build Thread https://www.camaro5.com/forums/showthread.php?t=609817

07-04-2023, 07:22 AM	#11
BiggFoot Drives: 2010 Camaro (M6) 1000+ HP SBE Join Date: Jun 2011 Location: Houston Posts: 1,391	Your sig states Magnuson so what psi are you running? If over 8 psi any cat is at risk of blow-out which could lodge downstream, inadvertently shut-off your exhaust flow, and cause nasty things to happen. I would just gut the cats and keep on rolling. __________________ F-1X, Cog Drive, ATI Super Pulley/Sprag ~ 19 psi Blower Cam Brodix BP BR 3 Heads Kooks LT Headers and full 3" exhaust Fore Triple Pump Fuel System with ID 1700X Injectors - E85 conversion DSS 9” Conversion (1400 hp axles, driveshaft, pumpkin) & Strange 3.70 gears McLeod RXT Twin HD Clutch & Upgraded Slave RPM Level VII TR6060 BMR Drag Suspension Package w/Strange shocks Carlyle 15" and M/T ET Street R radials 10.1 @ 143 mph 1/4 mile

07-04-2023, 08:06 AM	#12
FasNuf Drives: 2014 Camaro ZL1 Join Date: Jul 2019 Location: Oregon Posts: 1,618 View My Garage	This probably won't help you, but at least it's info. I went catless when I installed the Speed Engineering headers with their offroad pipe. I have NPP exhaust and almost never run it open because at WOT it's really raspy and obnoxiously loud. Headers, no cats and a muffler is just right for me. I get tired of the exhaust smell constantly. The only thing that seems to really help that is running E85. __________________ . . . . https://www.youtube.com/channel/UCgN...etl17hA/videos