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Jun 25, 2012 | 12:08 AM

Doug Roberts

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cat question

99 silverado I have 3in pipes i was thinking about cleaning out cat I live in FL and not smog laws but will I lose back pressure

Jun 25, 2012 | 9:00 AM

kevinkpk

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From: kevinkpk

Quote:

Originally Posted by Doug Roberts

99 silverado I have 3in pipes i was thinking about cleaning out cat I live in FL and not smog laws but will I lose back pressure

You don't want back pressure.

Jun 25, 2012 | 9:36 AM

Mudd Mutt

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From: Kansas

You do want some back pressure. Without any at all you'll burn up your valves. If there's a muffler on it your good but without a muffler or cats your valves will burn and you'll lose compression

Jun 25, 2012 | 9:48 AM

country_09

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From: Highlands

^ correct. Only want some. So keep a muffler on it, don't run compete straights with no cats or muffler.

Jun 26, 2012 | 12:13 AM

cleveland63b

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From: nebraska

you want scavenging not backpressure (close but they're different) and smog state or not you'd be better off getting a high flow cat.

Jun 26, 2012 | 10:43 PM

Doug Roberts

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Thanks guys was ready to cut and gut

Jun 27, 2012 | 10:23 AM

country_09

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From: Highlands

Don't get me wrong, i've cut mine off. But I cut them off for a reason. Both of them were clogged so when I gut em, a huge power increase came with it. It's not like that if nothing's wrong with em

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