You would like those tips?:
Twin Turbo 4.02" - 102mm
We can also put on 84mm - 3.31" Twin turbo tips
4" is huge...
Here's an example of Quad 4" twin turbo:
We got great results performance wise from mufflers only. If there is a difference, it is very minimal. When we manufacture cat backs, it is mainly because the original mid pipe design is flawed and real gains are to be expected, otherwise it's only a sound mod.
If you want custom tips, you will have to contact us at firstname.lastname@example.org
to set up a custom order.