For what it's worth I went supercharger on my 03 1.8 mx5 engine
Standard ecu , note the 03 ecu is classed as "adaptive" the earlier ecu' I know nowt about any how I fitted a sport cat off eBay kept the 2 o2 sensors and kept the egr system in place and its emissions were spot on no worries for Iva
Afterwards you can then go itb's or go f/I as you wish
Just ma twopenneth
