require a 740 tune? Wouldn't the 555cc program with 740cc injectors cause you to run way too rich? Also, shouldn't a 555cc program offer the correct fuel map for any 555cc injector, regardless of the brand? I know that Nismo 555's flow a little more than the Deatschwerks injectors, but all my injectors flow between 544cc and 549cc at 43.5psi of fuel pressure. Is there anyone who actually tunes specifically for the Deatschwerks 555's (aside from custom tunes on the dyno with a wide-band), or just a few different guys producing one generic 555cc tune? Since, I have zero confidence in Ash at this point (which is a shame, since I originally purchased my ecu from him, with the attractive offer of $50 reflashes. pft! ) I will be shopping for another eprom provider. Looks like Ztuner will be on my short list. Thanks for the info.