main things to change r inlet manifold, get a decatted straight thru exhaust, get a 4 to 1 exhaust manifold, induction and i believe there is such a thing as an emerald ecu for the 91 n/a's, never found 1 tho, ireland would be the place to search for 1 of those. also strip your interior for a better power to weight ratio, you wont believe the difference it makes! just be careful tho, starlet will become very tail happy in the corners if you let off so keep her pinned ;-)