CEL Codes

[MX3-Life]

Well i took the Magic Paperclip to it and all magic worked i got 3 magical codes:
8,16,25 Well i went into faq and it says that they are;

08 - Volume Air Flow sensor (VAF)
16 - Exhaust gas recirculation (EGR) system
25 - Fuel pressure regulator control solenoid

So basicly i believe the 08 is the MAF hense i need a whole new MAF for my Intake
and i know somewhat about EGR but basicly how screwed em I and how much would all these parts cost in total and how hard would they be to put in.

Just needing the skinny on these things... Thanks Alot!