Hey im new around here got my car not to long ago. I have a '04 5AT with a nismo intake and test pipes, but looking for a little more power. I ordered a crawford plenum, headers and Y-Pipe and wanted to know if i was gonna need to do something about the A/F ratios. I heard the car runs a little lean from manufacture so some slight mods would acutally help it out. Would you recommend a TS ECU or should i be fine leaving it alone???

 

i've personally never heard of the car running lean from the factory. the more airflow mods (headers, Y-pipe, plenum) you add the more lean it's going to get

 

*** im sorry, to rich