Original fuel injectors and fuel pump must be replaced for more fuel. Original injectors are rated to 450cc/min. The ones i got on ebay were 650cc/min Florida Injector Clinic.
I also had to replace the fuel pump with Walbro 255LPH . I got the “rewire kit” for more voltage. And one more imortant thing – Apexi SAFC II fuel computer. Since I replaced the injectors with bigger ones, ECU still thinks it is injecting as before but in reality it is injecting much more. Fuel computer fools ECU so that it thinks it gets less intake air so it injects in smaller amounts. To fine tune this computer I got Innovate LC-1 wideband controller that tells you exact fuel air ratio in real time. Chemically ideal combustion will take place when 14.7 parts of air is mixed with one part of fuel. http://en.wikipedia.org/wiki/Air-fuel_ratio