By electronic s/c I hope you mean the Thomas Knight kit found on
www.Boosthead.com and not the ebay junk. That is the only REAL electric supercharger on the market to date. Other good mods can be found in suspesnsion. For performance, headers are a good start, a good tune up, NGK wires & plugs, headwork, NST water pump pulley, alternator pulley, Custom cat-back, A series motor Throttle body (4age or 4afe), Nitrous Kit (if you don't go with the Electric S/S), Daox custom Int-Manifold insulator (see tercelclub.com or tercelonline.com), a thinner head gasket (TRD), high flow cat, Cam regrinds or TRD street spec if you can find them, and a full cat back if you didn't do it when you did the exhoust.