What to do to my 91 supercharged levin?

Question

i have a 1991 toyota levn gt-z and am after more power but dont know enough about this kinda thing. Looking for some help with this sumthing thats not to expensive.. below maybe 600dollars (NZD) . oh and btw im meaning in terms of increasing speed. atm it is boosting standard 8ish psi on the factory pulley kit and i no about the bigger belts but thats all i no about for increasing speed

is there nething else i can do?

and also do bov's do nething 4 superchargers?

thanks heaps!!

Answer 1

maybe some performance chips?