Hey Guys...yes, we had 4" tips (x4) welded into ZForce's FI exhaust. That's the biggest round tip that will fit comfortably in the Zele rear as each opening is 4.5"x10" (but taper towards the edges). The tips don't come attached to a y, as we felt it was better for the exhaust shop to fab their own y-piping to get placement perfect. Hope that helps and PM us if you need tips
