I suggest you not get it...if you want a TT just get one...but the insurance problem will probably stop you from doing so.
14.5 is way too much...he's smoking crack. Auto...eh...dont get this car.
Mods for a NA Z...
Intake
Headers
Exhaust
ECU
Cams
Clutch
Flywheel
Underdrive Pulley
then...
Port/Polish Heads
Stronger Pistons and Rods to raise compression
and not be neglected...
Suspension work...either spring shock combo or coilovers
Sway bars
Strut bars
Polyurethane bushings
Brake work...plenty of options in the brake category...
TT Brakes
Skyline GTR Brakes
Brembo's
Stillen's
Look around on the first 5 pages in this forum...there's lots of good info and you would have found your answers had you looked...
Other sites of interest...
www.twinturbo.net
www.zcar.com
www.stillen.com
www.freshalloy.com
www.sgpracing.com