Hi need help/explaination on this doubt . Isnt the Auto and Manual EPROM Racing Chip M27C256 can be use(interchange)o each others ECu for B16A VTEC DOHC ecu P30-3820-000? Actually what does this EPROM chip M27C256-12FI , the12FItan for what ? isnt speed ? Then the higher the better ? if just using M27C256 only, how?