Check your cats... - Page 44 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

E.T. · 08-05-2015, 08:25 PM

Very interesting thread....I know it's a bit old, but thought it might be worth reviving. Early in the thread, everyone said there were NO cats that could handle our 6.2L with a blower. Have things changed since then?

These Dynatech hi-flows are supposed to be designed for FI applications:
http://www.afcodynapro.com/store?sea...text=715-74120

I bought regular hi-flow cats with my headers (not the ones above) and I recently replaced them with midpipes after reading about all the potential problems running cats with FI. Personally, I think the car sounds amazing now, and idle is even better. In certain situations, it's a little loud in the cabin for my taste. Not sure if it's drone or just the engine noise, but it's a very deep bass sound. Sometimes it's just slightly annoying, but nothing major. Also, according to DIC, my mileage went up by a couple MPGs.

I'm debating whether I should try the Powercats Plus

My only real complaint is I'd like to tone down the sound, just a bit. Otherwise, the car is great with the midpipes. Heck, I even like the smell better. I just bought the midpipes, which weren't exactly cheap, so it'd suck to blow even more money.

Mods include Maggie, Livernois 2C cam, Dynatech headers, CAI and some other goodies. I'm right around 600rwhp.

Missile Man · 08-06-2015, 09:41 AM

Living in AZ I purchased a phenolic spacer that insulates the blower from the motor. The temperature is over 100 degrees and my radiator temp stays consistent at 194 degrees at idle and driving. No issues so far but this cat thing is worrisome. I’ll measure the blower temp the next time I drive it for a while.

E.T. · 08-06-2015, 01:37 PM

Quote:

Originally Posted by Missile Man

Living in AZ I purchased a phenolic spacer that insulates the blower from the motor. The temperature is over 100 degrees and my radiator temp stays consistent at 194 degrees at idle and driving. No issues so far but this cat thing is worrisome. I’ll measure the blower temp the next time I drive it for a while.

Supposedly, these new Dynatech cats can handle high HP, FI cars, but I'm not sure I want to spend $550 for them. All I really want is a slight reduction of sound. That's an awful lot of money to pay just for that. From what I've read, the majority of hi-flow cats are not designed to handle FI, so I don't think I'll risk putting my old ones back on.

GetYouOne · 08-07-2015, 02:29 AM

I am in the same boat I currently am running JBA High Flows with my turbo kit as of now so far so good, but was curious how loud and annoying deleting the cats are? Plus im in Cali. What kind of piping are u running in place of the cats?

E.T. · 08-07-2015, 07:47 AM

Quote:

Originally Posted by GetYouOne

I am in the same boat I currently am running JBA High Flows with my turbo kit as of now so far so good, but was curious how loud and annoying deleting the cats are? Plus im in Cali. What kind of piping are u running in place of the cats?

I got catless midpipes from Dynatech. The car sound really good at idle, but there's also a deep bass sound in the cabin that gets annoying (I can see my rear view mirror vibrating a lot). Even when cruising, there are certain RPM ranges that bother me. I decided to go ahead and just get the Dynatech hi-flows designed for FI cars.

I think part of the problem is, the midpipes are right under the cabin, so maybe that's why the noise is a problem. It's not terrible by any means, especially with the windows up, but it's just a bit much for my taste. When I had cats, I never had this problem.

GetYouOne · 08-07-2015, 05:27 PM

R u running their headers? I'm running OEM exhaust manifolds he said they sell a universal one?

Quote:

Originally Posted by E.T.

I got catless midpipes from Dynatech. The car sound really good at idle, but there's also a deep bass sound in the cabin that gets annoying (I can see my rear view mirror vibrating a lot). Even when cruising, there are certain RPM ranges that bother me. I decided to go ahead and just get the Dynatech hi-flows designed for FI cars.

I think part of the problem is, the midpipes are right under the cabin, so maybe that's why the noise is a problem. It's not terrible by any means, especially with the windows up, but it's just a bit much for my taste. When I had cats, I never had this problem.

E.T. · 08-07-2015, 07:44 PM

Quote:

Originally Posted by GetYouOne

R u running their headers? I'm running OEM exhaust manifolds he said they sell a universal one?

Yep, I have their SuperMaxx headers.

DisturbedSS · 10-27-2016, 03:46 PM

Older thread, even older response but one of the best pro/con discussions Ive come across.

GetYouOne · 10-27-2016, 05:31 PM

I removed my JBA high flows in August for JBA catless pipes and my high flows were fine as I am running a turbo. I actually loved the sound of the high flows and was disappointed in the raspy sound of the catless. I have bought a resonated xpipe to quiet it down, so we'll see. I know it's in the best interest of the turbo to run them. I have debated going back to my high flows.

Unreal · 10-27-2016, 09:29 PM

Quote:

Originally Posted by DisturbedSS

Older thread, even older response but one of the best pro/con discussions Ive come across.

So now its 2016 and talking to 2 reputable tuners here in AZ, seeing Jannettys and Maryland Speed responses, many of the same issues exist today.

I do agree however on infrequency of failures. NO ONE will ever get online discusiing how well thier HF cats work, only if they fail. Like yelp, all complaints, little praise. Im sure the % of failures vs successes is not even close in reality. If you drive like a WOT idiot all the time or increase psi beyond 6, then sure...chances go up exponentially as Ted mentioned.

For me and my Maggie install, it will be stock pipes and cats - custom tuned (to help with temps, running too rich or lean and general responsiveness vs just more HP) with a roto-fab CAI...call it done. The more 3rd party parts you introduce, the more issues you set yourself up for, not a given..but do a short take of all the yanked out parts from people posting and you will form an opinion.

So with my setup I will be at maybe 540-580HP range (will find out Nov 8th with a dyno run so hate to speculate now). Why spend another $1600 bucks for headers and install to gain another 30HP I dont really need? Tracking my car will constitute 0.5% on my actual driving time, so not about to throw gobs of money at getting caught up in that fantasy world.

I would never remove cats - ever - its 100% illegal in every form and fashion, no matter how you slice it. HF Green cats may/may not have issues with your F/I boost number...but still, again, illegal as they are considered "tampering" here in AZ and will fail a visual inspection every time. Guys say, "oh Ill just throw the stock pipes back on for inspection"...Ok, sure $600 from a shop to do it, re-tune and youve already cut your stock pipes to install LTs. Then do it all again to put it all back to its original setup?? yea, piece of cake $1200 bucks later! Ever replaced a header in a crowded engine bay that has F/I bits?

Rebuttal to the above.....
1 tuner in AZ made a great point, you can always justify going catless as AZ doesnt require emissions for 6 years on a new car. Most muscle car guys wont keep their cars that long anyways, so may not even be an issue..it will be the next poor sucker (other than the illegal portion, smell and in some cases unwanted additional noise). Just be forewarned if you trade it into a dealer with anything but stock cats, tubes...expect a trade in reduction.

Dont ever rely on forum opinions when it comes to emissions laws...every state is different. I read the AZ emissions laws top to bottom - like taking a sleeping pill.

You need to find some new tuners to talk to. There is so much wrong with your post it makes me want to bang my head into the wall until I pass out.

Unreal · 10-28-2016, 09:15 AM

Talk to CPR, or an actual good tuner.

There is no visual inspection in Arizona
There is no cutting or modification to put in long tubes
There is no need for a retune to put cats/stock parts back on
Replacing a header in a FI engine bay is <3 hour job start to finish
Dealer would probably never notice, and not care

By the same reasoning a catchcan is illegal, or a tune if you want to get into the details. Tampering with the tune or modifying the PCV system is just as illegal as no cats but seems your willing to do that.

As for 30hp and who is going to notice or need that? That is a pretty lame argument. Everyones goals and power needs are different. If you are just going for 550hp then sure, keep the stock stuff. It can last for a bit, but when you goto an event like No Fly Zone, and have one of the slowest cars there, you will want that extra 30rwhp pretty quickly.

Slowhawk · 10-28-2016, 06:34 PM

So far I've only seen 3 blowns motors personally at the shop due to messed up cats, about 5-6 cars that lost 100+hp with the cats pushing,caught them early enough before damage.

Most state laws make it illegal to even move cats and even illegal to even change mufflers.
Most people that mod here can care less about the cat, no-cat topic. In my state ( Ma) the testing is tough but they pass non- catted cars.

DisturbedSS · 10-31-2016, 12:56 AM

Quote:

Originally Posted by Slowhawk

So far I've only seen 3 blowns motors personally at the shop due to messed up cats, about 5-6 cars that lost 100+hp with the cats pushing,caught them early enough before damage.

Most state laws make it illegal to even move cats and even illegal to even change mufflers.
Most people that mod here can care less about the cat, no-cat topic. In my state ( Ma) the testing is tough but they pass non- catted cars.

So I'm really on the fence here. Let's say with a lt setup with cats puts me just under 600 hp with a Maggie and tune. I don't track but don't drive like miss daisy either. First is it worth almost 2 grand for this upgrade, does it really make a difference in driving feel and will these high flow cats survive. Any help would be appreciated.

Also 1 7/8 or 2 inch.

Outlaw77 · 10-31-2016, 02:58 PM

I ran kook's high flow cats with LT's on a maggie'd LS3 for about a year before I went cat-less. The cats were is great shape when I took them off. I was running about 9lbs of boost and was to 650 rwhp. I had to get dyno tuned again but I also installed larger injectors at the same time.

Is it worth it? That's up to you in the end. I think it's worth it. You have to have a good sounding exhaust with a Camaro. JMHO.

08-05-2015, 08:25 PM	#603
E.T. Drives: 2012 Camaro 2SS/RS Join Date: Jul 2010 Location: Cleveland, OH Posts: 3,273	Very interesting thread....I know it's a bit old, but thought it might be worth reviving. Early in the thread, everyone said there were NO cats that could handle our 6.2L with a blower. Have things changed since then? These Dynatech hi-flows are supposed to be designed for FI applications: http://www.afcodynapro.com/store?sea...text=715-74120 I bought regular hi-flow cats with my headers (not the ones above) and I recently replaced them with midpipes after reading about all the potential problems running cats with FI. Personally, I think the car sounds amazing now, and idle is even better. In certain situations, it's a little loud in the cabin for my taste. Not sure if it's drone or just the engine noise, but it's a very deep bass sound. Sometimes it's just slightly annoying, but nothing major. Also, according to DIC, my mileage went up by a couple MPGs. I'm debating whether I should try the Powercats Plus My only real complaint is I'd like to tone down the sound, just a bit. Otherwise, the car is great with the midpipes. Heck, I even like the smell better. I just bought the midpipes, which weren't exactly cheap, so it'd suck to blow even more money. Mods include Maggie, Livernois 2C cam, Dynatech headers, CAI and some other goodies. I'm right around 600rwhp. __________________ Last edited by E.T.; 08-05-2015 at 09:47 PM.

08-06-2015, 09:41 AM	#604
Missile Man Drives: 2010 2SS/Black Join Date: Mar 2009 Location: Tucson, AZ Posts: 608	Living in AZ I purchased a phenolic spacer that insulates the blower from the motor. The temperature is over 100 degrees and my radiator temp stays consistent at 194 degrees at idle and driving. No issues so far but this cat thing is worrisome. I’ll measure the blower temp the next time I drive it for a while. __________________ 2010 Black 2SS L99 Mods: * CAI Intake * Magnuson MP2300 TVS Supercharger/RDS Spacer * Vector Motorsports Tune * Stainless Power LT/Hi Flow Cats/Tru X-* Pipe/36" J-Pipes/40 Series * R1 Concepts ceramic pads and slotted/drilled rotors

10-27-2016, 03:46 PM	#610
DisturbedSS Drives: 16 Camaro 2SS Join Date: Aug 2016 Location: AZ Posts: 224	Older thread, even older response but one of the best pro/con discussions Ive come across. Last edited by DisturbedSS; 10-31-2016 at 08:00 PM.

10-28-2016, 09:15 AM	#613
Unreal Drives: 2006 Z06 Join Date: Oct 2010 Location: Gilbert, AZ Posts: 5,712	Talk to CPR, or an actual good tuner. There is no visual inspection in Arizona There is no cutting or modification to put in long tubes There is no need for a retune to put cats/stock parts back on Replacing a header in a FI engine bay is <3 hour job start to finish Dealer would probably never notice, and not care By the same reasoning a catchcan is illegal, or a tune if you want to get into the details. Tampering with the tune or modifying the PCV system is just as illegal as no cats but seems your willing to do that. As for 30hp and who is going to notice or need that? That is a pretty lame argument. Everyones goals and power needs are different. If you are just going for 550hp then sure, keep the stock stuff. It can last for a bit, but when you goto an event like No Fly Zone, and have one of the slowest cars there, you will want that extra 30rwhp pretty quickly. __________________ Nick Corvette Z06 -1200ish rwhp

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
SLP Headers / High Flow Cats (CHECK ENG LIGHT ON) HELP	LENN2010Z28	Tuning / Diagnostics -- engine and transmission	10	01-23-2012 06:55 PM
Question about JBA High Flow Cats fitment with Flowmaster American Thunder Catback	TCAT	Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons	5	11-06-2011 03:04 PM
Those with LT's, RESET your check engine light!	TAG UR IT	Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons	107	08-18-2010 02:51 AM
Thew check engine light... need help!!	Spiffyguitar	Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons	7	08-10-2010 03:26 AM
Dynojet results for intake, headers, exhaust with SOLO hiflow cats!	topgun1	Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons	17	07-02-2010 07:52 AM

08-07-2015, 02:29 AM	#606
GetYouOne Drives: 2012 2SS/RS Join Date: Oct 2014 Location: U.S.A. Posts: 1,595	I am in the same boat I currently am running JBA High Flows with my turbo kit as of now so far so good, but was curious how loud and annoying deleting the cats are? Plus im in Cali. What kind of piping are u running in place of the cats?

10-27-2016, 05:31 PM	#611
GetYouOne Drives: 2012 2SS/RS Join Date: Oct 2014 Location: U.S.A. Posts: 1,595	I removed my JBA high flows in August for JBA catless pipes and my high flows were fine as I am running a turbo. I actually loved the sound of the high flows and was disappointed in the raspy sound of the catless. I have bought a resonated xpipe to quiet it down, so we'll see. I know it's in the best interest of the turbo to run them. I have debated going back to my high flows.

10-28-2016, 06:34 PM	#614
Slowhawk Drives: 1999 Trans Am Join Date: Jul 2009 Location: Bridgewater,Ma Posts: 2,018	So far I've only seen 3 blowns motors personally at the shop due to messed up cats, about 5-6 cars that lost 100+hp with the cats pushing,caught them early enough before damage. Most state laws make it illegal to even move cats and even illegal to even change mufflers. Most people that mod here can care less about the cat, no-cat topic. In my state ( Ma) the testing is tough but they pass non- catted cars.

10-31-2016, 02:58 PM	#616
Outlaw77 Drives: 2018 Charger SRT 392 F8 Green Join Date: Aug 2010 Location: Oakville Ontario, Canada Posts: 1,910	I ran kook's high flow cats with LT's on a maggie'd LS3 for about a year before I went cat-less. The cats were is great shape when I took them off. I was running about 9lbs of boost and was to 650 rwhp. I had to get dyno tuned again but I also installed larger injectors at the same time. Is it worth it? That's up to you in the end. I think it's worth it. You have to have a good sounding exhaust with a Camaro. JMHO.