I would but one. I have an 1988 Supra with close to 400 RWHp. Watch out for the head gasket. That is about the main problem with them. There worth it for the price and the horse power you can get. Go to
http://www.jblmk3.com/ I based some of my parts on his site.
My mods are
K&N FI Pk
HKS blowoff valve
Magna spark plug wires
550cc Injectors (might go to 7200cc)
60-1 wheel turbo upgrade ( I might go to a T04E turbo)
Turbo elbow
Spearco Innercooler
Hks exhaust & test pipe and Down pipe
No cats
Exaust cut-off for open headers
fuel pump and manual pressure regulator
Lexus/REMI air fuel management system
Clutch Master stage 3
Fluidine radiator
Greddy boost controler
Gauges to monitor everything
HKS MHG