[Steve W]

The 993 injectors will be more than adequate for a highly modified 3.8 993 motor, even a race motor with headers and an open exhaust. It's the 964 injectors on some 964s that combined with a 3.8 and a hot cam like a 993SS, that run out of duty cycle above 6000 rpm full throttle, needing something like 103% duty cycle to meet optimal AFR target. In such instances the option is to either mod the fuel pressure regulator to increase fuel pressure by about 0.5 bar, or fit in 993 injectors which will leave a ton of headroom, more than any 3.8 will require, because as Rothsport notes the difference is 195 > 235 cc/min @ 3.0 bar and remember 964 and 993s run at 3.8 bar.