73-77 A-body TECH Includes 73GTO, LeMans, Grand Am, Can Am

          
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Old 05-03-2026, 07:34 PM
lakefect lakefect is offline
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Default 77 grand prix test pipe

Does anybody make a cat converter bypass pipe?

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Old 05-03-2026, 07:52 PM
SRGN SRGN is offline
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EPA would go after anyone who did. Cats are still covered under federal law (clean air act). Better off making your own, for test purposes of course.

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Old 05-03-2026, 09:21 PM
Flashflood Flashflood is offline
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My 77 lemans no longer has a cat. And has a sweet dual exhaust. I didn't even have to change the crossmember.

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Old 05-05-2026, 05:29 PM
lakefect lakefect is offline
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Quote:
Originally Posted by SRGN View Post
EPA would go after anyone who did. Cats are still covered under federal law (clean air act). Better off making your own, for test purposes of course.
That was helpful

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Old 05-05-2026, 07:00 PM
JSuchma JSuchma is offline
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I remember that right after catalytic converters started appearing in 1975, you could go to the local auto parts store and buy a test pipe and a slip-on plastic nozzle that went on the spout of the fuel handle. This was the easiest way to get leaded gas into your tank without tearing up the restrictor in the filler neck. How do I know this? It's exactly what I did with my brand-new 1976 TA. If I recall correctly, the payments on that car were about $200 a month.

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Old 05-06-2026, 11:54 AM
TXSTARFIRE TXSTARFIRE is offline
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Worked at a Champion Auto store from about 80 to 83. We sold a lot of Test Tubes.

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