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Old 11-23-2011, 12:32 PM   #76
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its a doggy dog world..i am intercooled ..catless...and muffler deleted..I love it !
**** yea!
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Old 11-23-2011, 12:57 PM   #77
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So extra fuel helps to burn up the cats quicker? How do the COT spark and fuel tables help to combat this? Better yet, can the COT spark and fuel tables help with this?
Fuel is used to Cool the Cats, I find many tunes with COT turned off, I never do this when cats are attached.

It is Not so much the fuel than the Volume of exhaust gas that needs to be converted.

The cats would need to be double they're current size to handle the flow and do a good job of converting.

Ted.
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Old 11-23-2011, 02:34 PM   #78
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Why doesn't someone make a CAT that is double, is there not a market for this item?
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Old 11-23-2011, 02:44 PM   #79
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Why doesn't someone make a CAT that is double, is there not a market for this item?
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ Check the Price of the cats for the ZR1 or CTSV
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Old 11-23-2011, 02:47 PM   #80
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I've seen this a few times already. I still don't know why people run cats with a blower cause it's not a smart idea.
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Old 11-23-2011, 03:12 PM   #81
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When I bought my long tubes I was told not to even waste my money on highflow cats because the S/C will destroy them. This was from a very reputible shop and sponsor here on C5.
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Old 11-23-2011, 05:06 PM   #82
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Just for kicks (and hopefully someone can explain the process), what about the blowers that have CARB approval? How could they get the approval if it was known to destroy cats?

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Old 11-23-2011, 05:33 PM   #83
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Just for kicks (and hopefully someone can explain the process), what about the blowers that have CARB approval? How could they get the approval if it was known to destroy cats?

Dean
Factory cats are More resilient than aftermarket cats and at 5-6 PSI it is not a problem.
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Old 11-23-2011, 05:35 PM   #84
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Factory cats are More resilient than aftermarket cats and at 5-6 PSI it is not a problem.
thanks Ted. Good to know. All the talk was a little concerning.
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Old 11-23-2011, 05:38 PM   #85
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We have seen several sets of Kooks Cats Fail with superchargers.
Awesome! I'll be taking mine off!!
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Old 11-23-2011, 09:15 PM   #86
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Seems like turbos make a LOT more sense, give a huge drop in exhaust temperature after passing through the turbine (and less stress on the crankshaft/engine). I know turbos can still get hot in the area of the cats, but it would seem with the turbine you'd at least be converting a lot of that heat energy into something usefull.
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Old 11-23-2011, 11:58 PM   #87
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Confused

This is what I'm confused about. Several large companies that install S/C who share this site use the oem exhaust when installing S/C. It seems that this issue is known so why are they using the oem cats. If I remove my kooks exhaust, headers and hi flow cats and put my oem parts back on how much HP will I loose . Also can instill use the 3.6 pulley
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Old 11-24-2011, 12:01 AM   #88
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Just remove your cats ^. And you'll lose between 30-40hp.
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Old 11-24-2011, 01:03 AM   #89
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For those of you that have full exhaust and removed your cats, how much louder did it get?!
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Old 11-24-2011, 01:57 AM   #90
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So would it be better to have twin turbos and high flow cats. Or can turbos replace the high flow cats? I've heard of that but never had it proven so to say. But if the turbo can fix the heating problem and run through the cats and be fine for the cats. Just might be the direction I would rather take vs. supercharger.
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Old 11-24-2011, 02:24 PM   #91
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Interesting.... I have a rattle in my left HF cat.. I've not opened the pipes to look at them though..
that's usually the a sign there breaking up by having rattles on OEM cats from my exprience being a mechanic and end up in the mufflers.

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Old 11-24-2011, 03:02 PM   #92
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ Check the Price of the cats for the ZR1 or CTSV
exactly big bucks, the insides look different too. oem has small holes on what looks like a gride or you could say honey cone looking. my kooks look like thin metal strips wrapped around the inside.
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Old 11-24-2011, 03:12 PM   #93
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Factory cats are More resilient than aftermarket cats and at 5-6 PSI it is not a problem.
Ted you suggest 3.6 pully with maggy if running long tube headers and cats right? or is that without cats? cats or no cats how does this effect boost. better to have a 3.4 pulley without cats? thanks
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Old 11-24-2011, 03:21 PM   #94
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FUUUUUUUUNNN!! Making sure my cats don't clog up on me.
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Old 11-24-2011, 03:42 PM   #95
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Same issue here. Running a E-force, cam, SLP headers with cats. When Vector Motorsports was tuning it, we thought we had bad fuel because he could not get any timing in it without spark knock. Those guys are awesome and he set it safe and away I went. After a couple hundred boosted miles, I swore the rods were coming out of the motor, come to find out, it was the cat material rattling around. Removed then and found them TOTALLY destroyed. Gutted them and off we go. Just need to get it back to re-tune for some more HP!!!
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Old 11-24-2011, 06:29 PM   #96
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Damn. About to put a whipple on my L99. Anyone know about the JBA competition exhaust system? V8 3" Cat-back System w/ 4" Dual Wall tips (3" to 3")
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Old 11-24-2011, 06:46 PM   #97
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For those of you that have full exhaust and removed your cats, how much louder did it get?!
'Loud' is a subjective question. I went from stock to Stainless Works 2" long tubes, cam, no cats, and Borla S type exhaust. It's definitely louder than stock but not obnoxious. However, that is my opinion. Someone else may consider my car too loud. See video....maybe this will help. Near the end of the video I had my wife open the cutouts so don't freak out about that sound!! LOL

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Old 11-24-2011, 06:55 PM   #98
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LEMME HEAR A LIL BIT!!!

Here is 1-7/8" stainless works, no cats and American thunder by Flowmaster. Also opening cutouts. This is stock ls3 cam. I agree with the above poster, sound is subjective. I feel neither his nor my car is very loud until you open the cutouts!

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Old 11-24-2011, 07:01 PM   #99
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Dude, at what you're making, I sure hope you have subframe connectors lol. Directed at 2L82Run
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Old 11-24-2011, 07:05 PM   #100
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LEMME HEAR A LIL BIT!!!

Here is 1-7/8" stainless works, no cats and American thunder by Flowmaster. Also opening cutouts. This is stock ls3 cam. I agree with the above poster, sound is subjective. I feel neither his nor my car is very loud until you open the cutouts!


WOW! It sounds like a big block with the cut outs open. I have a question though. Can you chose in which direction the cut outs face? Say for instance, towards the ground, or off to the sides?
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