[Cattman]

Originally Posted by Slickdvl

do you have to have the y-pipe+ header or will just the y-pipe bolt on? Is the y-pipe a different size than stock...which is why the combo is offered?

I think you've got the right idea... We frequently need to explain that since the only way that a regular performance y-pipe (one that was simply made to replace a stock y-pipe) would work with our headers would be if we made the header manifolds real short so that the outlets (that the y-pipe bolts to) are in the exactly the same position as the stock manifolds.

A design like that would have allowed y-pipe interchangeability, but it wouldn't have made any power (as another performance company discovered for themselves). Making the manifolds fit an existing y-pipe is like the tail wagging the dog. Instead, we designed the manifolds the way they needed to be, and then made a y-pipe to fit them.

BTW, the y-pipe in our header system includes design elements that are an advantage when used with header manifolds (but which would be unnecessary on a regular performance y-pipe used with the stock manifolds).

Let us know if you have any other questions.

Brian C Catts
Cattman Performance