I did a search, but found nothing.. I have a hi flow catco cat and i have the stock y pipe. I need to know the size of the y pipe.. i thought i had measured 2 3/4, but im not sure. Im going to check it out again. Ok I measured the y pipe, its 2 3/4-2 7/8ths.. I have a 3in ID to 3in ID connector.. Does anyone make an adapter that has a ID of 3 1/8th? thanks for the help guys.