03-23-2011, 04:24 PM
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#1 (permalink)
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A True Z Fanatic
Join Date: Jul 2010
Location: Newport Beach
Posts: 3,900
Drives: 2010 370Z/Saab 900se
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Quote:
Originally Posted by bigdog1250
I know Cats are the main restriction in the exhaust, that is why I don't think High-flow cats help too much. Its the removal of cats that makes power. Saying "high-flow" cat to me is like saying "fast snail"... I think its has more of a placebo affect on power.
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Sure, I guess you can convince yourself it is a placebo effect. The gains with HFCs are proven and while they may not make as much power as test pipes (duh), at least they don't smell, decrease rasp, have a hope of passing emissions, and are one of the best legal power adders. The most I have seen anyone gain here using test pipes over HFCs is 4-6rwhp. If your car puts down say 300whp, that is not an appreciable difference. You also lose torque with test pipes vs. HFCs.
High flow cats have a much less dense cell count, as well as a smaller catalyst which is why it is significantly less restrictive than the OEM cats. I think this picture makes the difference quite obvious:
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