91 Trans Am, Dual cat system Magnaflow from Y pipe back 3". It has stock exhaust manifolds. What will fit this without replacing Y pipe?

 

just to be sure

you have a cat back system (make isn't important)

you have the stock y pipe and stock exh manifolds

you want to know what headers you can put on but still use the factory y pipe, is that correct? Are you asking what will bolt up nice and sweet? If that's your question.................none

buy a y pipe too because the stock one is restrictive