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View Full Version : What is the ID of the stock intermediate pipe on 98-02 Z28's?

stringtheory
08-05-2005, 07:46 PM
I assume that the LS1's came from the factory with 2 3/4' intermediate pipes? Is that correct?
ninobrn99
08-07-2005, 06:17 PM
yup
Larry
08-08-2005, 10:35 AM
The passenger side down pipe off the header is double walled resulting in a very small inside diameter. Probably more of a restriction then the 2 3/4" intermediate pipe.