it depends on ur car and ur engine set up. Id suggest leaving the injectors alone jus give em a good cleaning. If u wantmore fuel get bigger throttle boddy and adjust ur cam so u can get a better fuel to air mixture. Them car like the Wrx and the Rx7 make their power by the turbos and how their programmed not the fuel. If i was you id get sum spoon parts from that web site in cally and u can get that thing moving.