You can look into a Dr. Gas "X" type, that is what I have on my car, perfect welds and no slag, but most quality muffler shops make their own version probably cheaper than a Dr. Gas unit. I have a bunch of literature from Dr. Gas and they have dyno proven results on increased HP and torque. Also I think all the Winston cup cars use them. In one of the Dr. papers there is a picture of a Winston cup car flipping thru the air showing the underside and you can clearly see the "X" type cross over