Question.

Did you leave the y-pipe you have on or did you put the one that comes with the headers. To me from the pics I have seen it looks like if I leave my y-pipe on then I will get more flow.

 

The headers wont go on with any y-pipe except for the one that goes with the headers

 

Ok thanks.....

 

If you are talking about this bent part of the pipe under the rear part of the manifold, it will not decrease performance. It is done on purpose in order to equalize the exhaust pressure from the front and the rear cylinders. This design is much better than any aftermarket y-pipe.