This is the exhaust tip we've used for years.
This is the 4" tip.
It's a very clean look and has a great apperence. The benefit is a larger looking tip with a smaller inside diameter to reduce the megaphone affect from a large tip.
It's a stainless steel double walled tip that can be cut to suit your needs.
It's available in: 3.5" and 4"
Dimensions:
2.25" to 2.5" and 3.5" out 8" long
2.5' to 3' in and 4" out 8" long
The inlet can be cut to suit the diameter, it tapers for 2.5" upto 3". The outer shell and inner pipe can be cut for length.
We typically use this tip on the AP2 S2000
These require welding.
https://www.youtube.com/watch?v=FKhG4uh1dOI