ON a car i have access to, i see no real difference when looking down directly..
phone pics.. sorry thats all i got.
the first pic is the drivers side ( usa) second is passanger side (usa)
i was a little more directly over the drivers side when taking pic, but i saw no difference.. maybe if you wanna be really anal less than a mm.. in all directions.
EDIT >>>>> I TAKE IT ALL BACK... it was dark where it was parked
it was brought inside.. the right side does stick out further then the left... 3 or 4 mm at best.. manufacturing tolerance i guess ??? not really noticable espically since most peoples view of theses pipes will be as they pull away from them at a very high rate of speed