Big Gun Exhuast, Power Commander 5?

Just got a Big Gun EVO U Full Exhaust installed on my ’15 Scrambler 1000 and the tech told me theres some hiccups in the throttle response…he suggested I get a Power Commander 5 and a custom dyno and tune. I have no idea what I should be doing..

Do you guys think I need a PC5 and do I need some crazy custom map / tune or can I toss the PC 5 on and it’ll auto-tune?

Any advice would be helpful

Thanks!