View Poll Results: Which is Worse for Exhaust Flow?
Gutted Cats
1
14.29%
Straight Pipe Through Cats
6
85.71%
Voters: 7. You may not vote on this poll
Gutted Cats/Straight Pipe Through Cats..Which is Worse for Flow?
05-28-2009, 06:05 PM
#1
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Gutted Cats/Straight Pipe Through Cats..Which is Worse for Flow? Hey everyone, My high flow cats that came with my Kook's Headers are starting to break down on my CTS-V. I have to leave the cats on there for visual inspection for emissions but I want to either gut them or run a straight pipe through them but I don't want to lose any power. Which would be worse for the flow of the exhaust (and why)?
Last edited by SkullV; 05-28-2009 at 06:11 PM.
05-28-2009, 08:31 PM
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I used to have a 2007 Mustang GT, Kooks used my car to design the H-pipe they now sell for the S-197's. I don't know about your car, but I know with mine the midpipe was designed as a "modular" piece, and you could just remove the two front pipes with the cats and swap in the two off-road pipes in their place. If you can, I'd just do that, and then get MIL eliminators for your car. At that point, as long as your car will pass the OBD-II inspection, you might just have to find a "friendly" inspection shop, or tip the guy $20 to overlook the missing cats.
Don't gut the high-flow cats. It's a PITA, a waste of money, it'll sound like crap... If you have your heart set on having cats though, just call up Kooks and order new ones, you shouldn't need a whole new midpipe.
Don't gut the high-flow cats. It's a PITA, a waste of money, it'll sound like crap... If you have your heart set on having cats though, just call up Kooks and order new ones, you shouldn't need a whole new midpipe.
05-28-2009, 08:58 PM
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I used to have a 2007 Mustang GT, Kooks used my car to design the H-pipe they now sell for the S-197's. I don't know about your car, but I know with mine the midpipe was designed as a "modular" piece, and you could just remove the two front pipes with the cats and swap in the two off-road pipes in their place. If you can, I'd just do that, and then get MIL eliminators for your car. At that point, as long as your car will pass the OBD-II inspection, you might just have to find a "friendly" inspection shop, or tip the guy $20 to overlook the missing cats.
Don't gut the high-flow cats. It's a PITA, a waste of money, it'll sound like crap... If you have your heart set on having cats though, just call up Kooks and order new ones, you shouldn't need a whole new midpipe.
Don't gut the high-flow cats. It's a PITA, a waste of money, it'll sound like crap... If you have your heart set on having cats though, just call up Kooks and order new ones, you shouldn't need a whole new midpipe.
05-28-2009, 09:48 PM
#6
Teching In
I see what you mean. Thats a good question. I would imagine a straight pipe through would be a smoother, more direct flow.
I gutted cats on a LT1 Impala SS and it was loud as hell.
I gutted cats on a LT1 Impala SS and it was loud as hell.
05-29-2009, 10:40 AM
#7
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gutted cats are worse because they create a large low pressure zone in the hollowed cat (since it has so much more volume to fill) which slows the velocity of incoming gasses. At least thats what my advanced diagnostics instructor told me, and it makes perfect sense.
But honestly if you own a CTS-V and have the cash for Kooks - I say get replacement cats.
But honestly if you own a CTS-V and have the cash for Kooks - I say get replacement cats.
