3" pipes or 2 1/2' with cutouts?

kanders said
The reason I was thinking 2 1/2" is also so I can use factory tips. Would there be an advantage to a 3" system when its restricted to 2 1/2" at the end? Kev

The 2 1/2" tips would be a choke point.
But don't some companies make OEM style tips for bigger pipes?