[1sicklx]

PMAS and Pro-M are not the same company. C&L meters work by using the factory sensor and changing the sample tube ... in my experience this hasn't worked very well.

I would get a MAF from PMAS or hold out for the new meter AFM is coming out with ... a lot of hype but only time will tell how effective it is.

As far as tuning goes, what's "necessary" and what's "beneficial" isn't always the same thing ... just because it might not be a necessity to fine tune the car for it to be drivable that doesn't mean you won't be leaving something on the table.

tweecer
AFM PMS
SCT Chip
FAST XFI

take your pick.