Good news mate, i'd consider one of the GT series turbo's rather than a T4, also if your thinking of upgrading the turbo you may wanna think about swapping from a charge cooler to a Intercooler, as a bigger turbo will increase the the temps right to the limit of the standard set up...

If your gonna do that, then it may be worth hanging fire on the viper kit (do they do one for the FRS?) as you need to relocate the battery to where the airbox currently sits, and relocate the airfilter!!

As it's Xmas there isn't a meet this month but it's back on from january, i'll PM you my number!!