You will likely peg both of the meters mentioned (the 80mm Pro-M was good to a lil over 500rw for me), You can run a 03-04 90mm SCT meter alls you need is the adapter harness. Those meters can support some big power (BA2400/2800) but the SCT chip is a req also..those meters are cal'ed via chip.
Mass air tech sells the adapter for 40 bucks. They claim that the 80mm make a better street unit than the 90mm BTW Mass air tech was Pro M and for our car the selection has slimed down a bit and I rather not use the C&L.
If u plan to make around 500rw..go 80mm...if u plan to make more be prepaired for the meter to peg.
As far as the 90mm not being streetable complete BS...maybe their 90mm.
I run a 90mm now (SCT) and can tell no diff from when I had the Pro-m 80mm cept i can make over 600rw and the meter not peg