2017 kx450 slip on

New to the forum. I'e been away from dirt bikes for years. Fuel injection is new to me. I searched but really didn' find anything on my question. I just bought a new 450 that came with a yosh stainless slip on. Do I need to changed the head pipe or is the head pipe good enough? I know technology has come a Long way. And should I just use stock green coupler? These things have become technical from when I stopped riding. Thanks in advance. 

You dont need to change the headpipe  if everything lone up.

If you are a "beginner" start with the black coupler, you almost dont feel any differance changing the couplers 

Edited by skorpan777

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