It is for engine management. it will be tailored to your car and only your car. It will run better and you get free updates as you add parts.
Here is the ECU section, http://www.focusfanatics.com/forum/f...splay.php?f=79
Please excuse Paul, me and the banter.
He still hates me for what happened at Band Camp up by Eagle River.
133whp-126ftlbsTQ Eclipse CD8443,Eclipse PA5422, JBL GTO751EZ, PPI 356cs(Rebranded A/D/S 346cs), JBL p1024, SubThump enclosure, RAAmat BXT, Damplifier Pro
Hatch Nation #140
Caeci caecos ducentes