Whats the size of the coupling that connects the crossover tube to the y-pipe? Mine is cracked thats where i found my boost leak so I am going to replace that coupling with a silicon coupling, so i was wondering if you teches can tell what the size of that coupling would be? please help

 

Get a 2 3/4 ID coupling. www.turbohoses.com sells some nice couplings in various colors. I just got some new black ones through them. You might as well get 2 couplers for both ends of the y-pipe.