Although this is a pretty old thread , I have a 1991 maxda 323 GTx same 1.8 Bp pretty much the same as Josh G 123 's car an I made approximately 320 ish on a stock BP motor with DTa ecu good front mount intercooler, Siemens DEka 880cc ,and a few other add ons
with a full race motor we looking at making near 500hp on a road race application Dover raceway in Jamaica with everything I could think of or afford , of course I had to change running gear long time