URD TCAI W/ MAF Calibrator. & Headers/Exhaust

So, Im looking into buying the URD TCAI for my Tacoma. My concern is that with this CAI is it absolutely neccissary to have the MAF sensor calibrator as well?

Im aslo looking into headers and exhaust.
Which exhaust system is recomended?
The URD Mk2 exhaust, or the Flomaster system?
& if I choose to go with Flowmaster, is it compatible with the
JBA 2035S Headers or URD Spec-U LT Headers?

Thank you

 

NOT absolutely necessary. I ran my URD CAI for about 6 months before I plumbed in the MAF Cali. Granted, best way to ensure you are taking advantage of the CAI is to get the Cali, but it's not required and runs fine without it.

 

Ok, great! Thanks for the imput. I just wasnt sure I wanted to spend around 500 dollars for a CAI! Yet...

Any advice with the headers and exhaust?