Chrome exhaust tip

[George Macecsko]

I have a 2018 Denali dually that I use to tow a 5th wheel.  I am thinking about adding  a turn down tip to reduce soot and heat on the trailer. Everything I find is 14-16 inches long. I don't want the extend the length  . Can I cut off the original exhaust?  Will that cause any issues? 

[Diver6]

That's exactly what I'm going to do but leave about an inch after the venturi and slid the tip over. You need that air gap to pull in cool air.