FMF Powercore 4 Slip on

I know I want this slip on, but I'm wondering if I'm going to have to Rejet. I'm buying just the slip on, and my bike is a 2001 DRZ 400 E model! 

 

I also have a R&D racing Flex jet fuel screw, Don't know if that helps.

 

Do any of you have the Powercore 4?  did you rejet? if you didn't how does the bike perform?

The elevation where I'm at is low, Phoenix Arizona

Thx for any help :ride:

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