Boostzor You'll find that companies like TRD, TOMs, Mines, Blitz, Night Pager etc do/have made ECU/Chip replacements for the JZA70. Most normally increase the boost limit, rev limit, boost cut limit, 180 Speed restriction etc but are not generally adjustable for boost - you'd still need an EBC to alter your desired boost level. Some of the Generic aftermarket ECUs may well offer EBC with the basic ECU but that's a totally different avenue altogether.