This is the exhaust tip we've used for years.
 
This is the 3.5" 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.
 
This the common tip we use on the AP1 S2000
 
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
 
 
The inlet can be cut to suit the diameter, it tapers for 2.25" upto 2.5". The outer shell and inner pipe can be cut for length.
 
 
We typically use this tip on the AP1 S2000
 
See Video
 
https://www.youtube.com/watch?v=FKhG4uh1dOI
 
 
 
 WARNING: California Proposition 65