Hi flow cats?

Photonfanatic · Jan 13, 2012

There's no such thing is there. All these companies like magnaflow and flowmaster say they have "High flow" cats but how could that be possible if the cat-converter isn't actually any bigger? Its not longer, and its not... fatter. They look the same, yet they're supposed to be "high flow". I'm going to have to call BS on this one. I mean I guess they could actually do it, but then of course you're not going to pass the sniffer test so what is the point. Perhaps someone can explain if I'm missing something here.

castine917 · Jan 13, 2012

External dimensions would stay the same to pass fitment issues. Internally they can space or use less of the "honey comb materials" to flow more cfm. I will have to let someone else try to explain how they could still pass the sniffer as I don't even have emissions tasting in my state.

twovalveterror · Jan 13, 2012

they claim that they do pass emissions, and I have seen dyno charts to prove that they flow better. how they do it I'm not sure.

ttocs · Jan 13, 2012

I have a high-flow catted-X on mine but mainly because at the time I was looking for a midpipe it popped up on craigslist for $100 with out a scratch on it. As for flowing mine will not be a good example since I have a side exhaust system.

JRad405 · Jan 13, 2012

I have high flow cats on my car. I pass emissions every year.

Photonfanatic · Jan 16, 2012

I'd like to know how they compare to straight pipe.

spdtrip · Jan 16, 2012

as far as power goes I dont think they limit you. A good friend has cats on his 2004 gt full boltons and long tubes and puts down 270rwhp thats one of the most ive seen.

Photonfanatic · Jan 28, 2012

How much louder than a regular cat are they?

ivan12 · Jan 28, 2012

They're a little louder than stock, but for me getting rid of the fuel smell of the straight X was worth it.

Mustang Mark · Jan 28, 2012

Photonfanatic said:
I'd like to know how they compare to straight pipe.

my car had a bbk high flow catted H when i bought it, i removed the cats and my butt dyno noticed no difference.

Mustang Mark · Jan 28, 2012

Photonfanatic said:
There's no such thing is there. All these companies like magnaflow and flowmaster say they have "High flow" cats but how could that be possible if the cat-converter isn't actually any bigger? Its not longer, and its not... fatter. They look the same, yet they're supposed to be "high flow". I'm going to have to call BS on this one. I mean I guess they could actually do it, but then of course you're not going to pass the sniffer test so what is the point. Perhaps someone can explain if I'm missing something here.

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