High Flow cat, Is this the right one? Illegal? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-15-2005, 05:48 PM   #1
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Default High Flow cat, Is this the right one? Illegal?

http://cgi.ebay.com/ebaymotors/ws/eB...category=33629


Is this the right part for the Bonneville?Horse Power gain? Probably 5 HP?

Is it illegal to replace your cat if its still functioning?
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Old 06-15-2005, 06:28 PM   #2
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Thats the one I've got, though it won't yield a 5HP gain. It is perfectly legal as well. Here the rules are you must have a cat on your car if it came with one, and thats pretty much it.
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Old 06-15-2005, 07:22 PM   #3
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I don't know if you need the air tube version or not.

But otherwise, I believe they come with CARB certification.
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Old 06-15-2005, 07:59 PM   #4
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No he won't need the air tube. He doesn't have a smog pump.
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Old 06-15-2005, 08:09 PM   #5
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Not even a 5 horse power gain?

Why do people go for high flow cats? Just a replacement?
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Old 06-15-2005, 08:27 PM   #6
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Depends on the car. Maybe the L67'* might gain that. There IS a gain. Probably 2-5 hp depending on mods.
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Old 06-15-2005, 10:33 PM   #7
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Probably would be like 2HP for me. I will take what i can get though...hehe. Does yours smell like rotten eggs? Mine does, and I am waiting for it to kick the can.
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Old 06-16-2005, 04:50 AM   #8
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A high flow cat works in conjunction with other mods, the more you have the likely hood that you will develop more power.
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Old 06-16-2005, 02:02 PM   #9
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So if I plan on adding things like,headers, rockers,cam,nos and a Super Charger a high flow cat would be worth it?
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Old 06-16-2005, 02:32 PM   #10
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Yes. Gotta remember our engines don't move all that much air [compared to some others], so gains like that aren't as noticable.

If your original was shot, you will gain a few ponies.. but if it was in good working order, then you probably won't feel a thing. <--notice how I didn't say won't gain a thing.. just that you won't feel it.


-justin
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