Catalytic converter - Page 3 - Chevy Impala SS Forum
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post #21 of 22 (permalink) Old 04-19-2019, 11:26 PM Thread Starter
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New CAT's installed. Let me just say that "direct fit" doesn't actually mean they bolt up without having to purchase longer bolts (the flanges were welded on the CAT's 1/2" too far forward) and the passenger side the flange was also rotated clockwise about 3/4" so the support bracket no longer works. The CAT's were also 1/2" too short so now my exhaust pipes rattle everywhere. I'm going to a friends house in the morning to see about "clearancing" the exhaust to get rid of the rattles. On the plus side, the original driver side CAT was half plugged and now the car runs much better. I did have to replace the driver side knock sensor pigtail as the insulation on the wiring was bare and wires were all touching each other.

1996 DGGM Impala SS
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post #22 of 22 (permalink) Old 04-21-2019, 01:29 PM Thread Starter
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Quote:
Originally Posted by 4x4high View Post
New CAT's installed. Let me just say that "direct fit" doesn't actually mean they bolt up without having to purchase longer bolts (the flanges were welded on the CAT's 1/2" too far forward) and the passenger side the flange was also rotated clockwise about 3/4" so the support bracket no longer works. The CAT's were also 1/2" too short so now my exhaust pipes rattle everywhere. I'm going to a friends house in the morning to see about "clearancing" the exhaust to get rid of the rattles. On the plus side, the original driver side CAT was half plugged and now the car runs much better. I did have to replace the driver side knock sensor pigtail as the insulation on the wiring was bare and wires were all touching each other.
Put my car up on my buddy's lift yesterday and found where the rattles were coming from, some before and after pics.


Not sure why the last 2 pics got rotated and don't know how to fix, sorry guys.
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1996 DGGM Impala SS

Last edited by 4x4high; 04-21-2019 at 02:00 PM.
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