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Old 05-11-2010, 02:08 PM   #1
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Hi-flow cats or cat-delete?

Question- if I do a cat-delete and do something like an X pipe, do I need to get the O2 eliminators? anyone have experience doing this? I want to get that powerful sound I'm looking for and let the new Doug Thorley headers breathe.

Inspection is not an issue
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Old 05-11-2010, 02:15 PM   #2
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IMO - High-Flow cats...

I had thorleys, no cats, 2.5" and flowmaster delta-40's on my 1972 Blazer and it was awesome but it was a pre-cat vehicle.

Since then I have had good luck with HF Cats and similar exhaust on other Chevy's... and gotten what felt like the same amount of power.
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Old 05-11-2010, 02:16 PM   #3
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Interestedin finding out some info on this as well!!
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Old 05-11-2010, 02:21 PM   #4
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ok, on a previous post, Jannetty Racing compaired all popular headers with and without high flow cats and found NO difference in performance.So why not run them?? just curious.

heres the link
http://www.camaro5.com/forums/showth...ht=header+test
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Old 05-11-2010, 02:33 PM   #5
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Originally Posted by coptzr View Post
ok, on a previous post, Jannetty Racing compaired all popular headers with and without high flow cats and found NO difference in performance.So why not run them?? just curious.

heres the link
http://www.camaro5.com/forums/showth...ht=header+test
Probably $$$. Hi flows are something like $400+, but two straight sections of pipe are what, $50?
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Old 05-11-2010, 02:35 PM   #6
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Probably $$$. Hi flows are something like $400+, but two straight sections of pipe are what, $50?
true, but it does make it easier when you actually need them on the car for warranty work, inspection (If i move away from my local guy), trading, etc.

Would there be any noticeable sound difference b/w no cats and hi flow cats?

also, I don't believe DTH has an application yet for hiflow cats.
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Old 05-11-2010, 02:38 PM   #7
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Quote:
Originally Posted by coptzr View Post
ok, on a previous post, Jannetty Racing compaired all popular headers with and without high flow cats and found NO difference in performance.So why not run them?? just curious.

heres the link
http://www.camaro5.com/forums/showth...ht=header+test
thanks for posting this. I get people telling me all the time that you'll get signficant power increases with hi flow cats vs. stock. it's good to see real comparos. I'm really looking for the sound.
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Old 05-11-2010, 02:42 PM   #8
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Well the money is a very good point.But with no cats you will have to get that "tuned" out if your not running rear o2's correct?? thats what 300 to 450?? I know they say you should still tune with LT's, but you dont have to right?? I too am having the same issue and would like the same answers as "topdown"...thanks for all the help
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Old 05-11-2010, 02:59 PM   #9
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you'll need a tune eventually with hiflow cats too or the check engine light will come on. besides youll get a good deal more power if you add the tune
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Old 05-11-2010, 03:14 PM   #10
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Valid point.I know I have read in other post that some people say the light comes on and some dont.Sound like the tune is still the best bet.
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Old 05-11-2010, 03:34 PM   #11
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I had Hi-flow cats on then took them off and did straight pipes. You will get DTC's either way. Im going to reinstall cats because It has a very strange rattle rasp noise at about 3k rpms that I dont like since the straight pipes were installed.
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Old 05-11-2010, 03:35 PM   #12
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Quote:
Originally Posted by coptzr View Post
Well the money is a very good point.But with no cats you will have to get that "tuned" out if your not running rear o2's correct?? thats what 300 to 450?? I know they say you should still tune with LT's, but you dont have to right?? I too am having the same issue and would like the same answers as "topdown"...thanks for all the help
topgun?

well a standard custom tune is usually $300-450 yes, and they can tune that out. If you delete the cats, you can get an O2 delete which would basically be just like a skip shift eliminator to trick the computer.

you should always tune when adding performance items on, like exhaust, headers and intake, and definitely a s/c, since your car's computer is still set on stock settings. you'll need to be able to have the computer learn your new performance items and take advantage of the potential power gains
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Old 05-11-2010, 03:35 PM   #13
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yeah, ive heard of people running hiflows for 4 or 5 hundred miles before the light comes on, but it should come on for everyone eventually since the cats arent heating up as much or as fast
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Old 05-11-2010, 03:37 PM   #14
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Quote:
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I had Hi-flow cats on then took them off and did straight pipes. You will get DTC's either way. Im going to reinstall cats because It has a very strange rattle rasp noise at about 3k rpms that I dont like since the straight pipes were installed.

hmmm, this is discerning with that noise.

but did you have the O2 sensor eliminator and still got the codes?
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Old 05-11-2010, 04:01 PM   #15
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ive been running offroad pipes for several months now.. I have no weird rasp at 3k sounds like it may be harmonics in your catback. I love the way mine sounds with the offroad setup but I was thinking of doing cats just to stay "legal" muahahaha not that I really care in a non-inspection state just maybe thinking a little green, but not prius green.
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Old 05-11-2010, 04:22 PM   #16
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hmmm, this is discerning with that noise.

but did you have the O2 sensor eliminator and still got the codes?

I had 5 codes that came on after the long tubes and high flow cats were installed. I had them tuned out and it stayed off. It came back on with the straight pipes but im willing to bet o2 sims would keep it off
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Old 05-11-2010, 04:24 PM   #17
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ive been running offroad pipes for several months now.. I have no weird rasp at 3k sounds like it may be harmonics in your catback. I love the way mine sounds with the offroad setup but I was thinking of doing cats just to stay "legal" muahahaha not that I really care in a non-inspection state just maybe thinking a little green, but not prius green.
Im not sure, it might be.. Its really annoying until the exhaust gets super hot. I have an X-pipe too maybe something with the 3" straight pipes/3" X-pipe/ 3"exhaust combination.
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Old 05-11-2010, 04:24 PM   #18
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Sorry topgun1, the second post was from topdown...I easily confused I guess.I have the D.T. shorties on now with the GMPP mufflers.Car sounds great, but I am gping with the Vector Motorsports stage 2 cam, SLP L.T.'s with cats and K&N CAI, plus the Vector tune.I really dont like that "glass-pak" sound like I hear in some cars with the muffler delete, but that is PURELY my opinion...I like that deep rumble like the old big block cars.
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Last edited by coptzr; 05-11-2010 at 05:20 PM.
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Old 05-11-2010, 04:44 PM   #19
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Hi Flow cats
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Old 05-11-2010, 05:01 PM   #20
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yah i bet its harmonics.. every catback has that "Sweetspot" or sourspot to some.
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Old 05-11-2010, 05:41 PM   #21
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U will only gain minimal horsepower without cats so use high flow Ur exhaust note is much cleaner and muscular with high flow cats
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Old 05-11-2010, 06:35 PM   #22
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Sorry topgun1, the second post was from topdown...I easily confused I guess.I have the D.T. shorties on now with the GMPP mufflers.Car sounds great, but I am gping with the Vector Motorsports stage 2 cam, SLP L.T.'s with cats and K&N CAI, plus the Vector tune.I really dont like that "glass-pak" sound like I hear in some cars with the muffler delete, but that is PURELY my opinion...I like that deep rumble like the old big block cars.
nice combo. Yeah, I don't like the glass-pak sound either. that's why I went with Magnaflow 3" exhaust with the mufflers, nice deep rumble and sounds sweet at WOT. man, with that new cam, you'll be sounding like a true old big block!

As far as the option for hi-flow cats or a cat-delete, I think i'm going to go with the hi-flow cats since it would really be more feasible and don't have to worry with putting the cats back on if I need to in the future. don't want to worry with the codes or O2 sensor issues either. thanks for all the info guys.
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Old 05-11-2010, 09:34 PM   #23
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so what are people's recommendations on what brand to use for hi-flow cats? I just want to replace the two stockers. from what i've seen, it seems it's not that common to just buy hiflow cats alone. Just need them to bolt up to the 1 7/8" DT shorty headers and the 3" Magnaflow cat-back.
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5th Gen Camaros of the Carolinas SIM, 2SS/RS LS3 5/7/11 453.9 RWHP 427.5 RWTQ
VMS Stage 2.5 Comp Cams kit, Cold Air Inductions intake, ADM race scoop, DT 1 3/4" headers, Solo cats, 3" Magnaflow catback, Pypes cutouts, HP tune, H&R SuperSport springs, Eibach sways/spacers, TexasSpeed UD pulley, LSR tensioner pulley, Barton shifter, skip shift eliminator, powder-coated calipers, R1 concept rotors, StopTech pads, Granatelli wires, Lloyds mats, tint, AAC afterburner taillamps, AAC scanner/sidemarkers, SRP pedals, custom engine cover, black bowties, Ridergraphix hood spears....
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Old 05-12-2010, 12:00 PM   #24
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I always suggest HF cats. Mainly because of the smell of the exhaust when no cats are used.

Very strong fuel smell that burns the eyes. The cats clean all of that up.
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Old 05-12-2010, 03:38 PM   #25
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didn't think about that Kirk, but definitely obvious! I'll wait on SOLO performance for their hiflow cat application for the Camaro.
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