Need Help ( 08yz450 with Titanium Ti-4)

Had a couple questions for anyone out there. Just got a 08 yz 450 and I bought the titanium ti-4 full exhaust system. Pro circuit

Questions number

1. Is re-jetting necessary.

If so how hard is it to re-jet or is it worth it to have a shop do the rejet

2. Anyone know how well this will perform compared to the stock exhaust

3. Why is yamaha The SH%T!!!

Thanks for any help you could provide

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