??? for guys using the factory LS1 lid
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I used 3" Fernco Couplers from lowes. They cost 2 bucks and are just black 3" in/3" out rubber couplers and I only used 1. I had to use a heat gun on the TB side for about 30 seconds, but after that, no issues since but like 96lt1m6 said...we all use aftermarket.