is the air tube thingy on the side of the cat converter good or bad. just wondering because i am geting aftermarket high flow cats and want to know if i should get it with or with out it. thanx for your help

The air tube is designed to be connected to an air pump to increase the efficiency of the converter, if your car has the air pump, get the tube style.

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If this is for your '86 T/A, then definitely get the air tube model. A working air pump won't cost you any hp.

The cat with the tube on the side is referred to as a 3-way with oxidation. It helps to further reduce HC/CO. Get it.

so i should get it. just wondering because im gona get a complete new exhaust system from headers to mufflers and was wondering if i actualy needed it at all.

<font face="Arial,Verdana" size="2">Originally posted by Todd80Z28:
The cat with the tube on the side is referred to as a 3-way with oxidation. It helps to further reduce HC/CO. Get it.</font>


Actually a oxidation cat is a two way cat. The three way cat has, in addition to the oxidation "section", a reduction "section" to strip the o off the no2. Camaros didn't get 3 way cats until 93 or 94.

The air tube to the cat provides oxygen to the cat under certain circumstances. If your car has the tube now the replacement cat should have it also, if not, not.

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Dave

There is a fine line between "hobby" and "mental illness".



[This message has been edited by Mstrtch (edited November 26, 2004).]