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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

how to replace a bad cat....

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Old Jun 23, 2011 | 07:19 PM
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Default how to replace a bad cat....
As the title implies the cat converter on my 93 Z28 is bad, its very rattly, I get terrible gas millage, not getting any high end power, and the exhaust is cold. So my question is how do you remove the old one and install a new one? There is a magnaflow cat at advance auto parts I'm looking at and if it has the same inlet and outlet size I'll use that one. Do you saw the old one off or is it clamped on?

THanks in advance
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Old Jun 23, 2011 | 07:24 PM
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The factory cat is welded on. Do you require a cat? If not spend a few extra dollars and get an off-road y-pipe that bolts to the factory manifolds. Or put a set of headers.
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Old Jun 23, 2011 | 07:29 PM
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The front is welded and the rear is bolted on. The magnaflow cat is supposed to be a quality unit. For free you can gut it out. It will drone a little but it would get you by until you decide what to do.
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Old Jun 23, 2011 | 08:11 PM
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I live in NC so I'm required to have a cat. Is there a way to clamp the new cat in where the original was welded in?
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Old Jun 23, 2011 | 08:31 PM
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Originally Posted by IronOutlaw
The front is welded and the rear is bolted on. The magnaflow cat is supposed to be a quality unit. For free you can gut it out. It will drone a little but it would get you by until you decide what to do.
Really? Both my cats were welded on both ends in the middle of the y pipe.
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Old Jun 23, 2011 | 08:52 PM
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Originally Posted by white ghost
Really? Both my cats were welded on both ends in the middle of the y pipe.
His car is a 93. 93, 94, and some 95 models have one cat at the end of the y pipe. Its a completly different setup than the two cat cars.
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Old Jun 23, 2011 | 09:55 PM
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Originally Posted by IronOutlaw
His car is a 93. 93, 94, and some 95 models have one cat at the end of the y pipe. Its a completly different setup than the two cat cars.
Oh. Ok. Didn't know that. Cool.
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