Yeah if you're having your ECU chipped and you have a Walbro 255 w/ afpr then I say have the ECU written for 600cc/min or even 650cc/min and then just use fuel pressure to get your AFR right. Even at 25psi, with a base pressure as high as 45psi, you're looking at a max fuel pressure of 70psi which is within what a rewired 255 can handle. RoadRace says that a Walbro flows 182lph at 73psi rewired. 650cc/min injectors will flow 156lph at 100% IDC so you still have plenty of room on that pump and you should be good for any variety of 16g. IMHO E316g > 18g anyway.
this is a spare ecm i have. the board looks clean there is a sticker on it that it was rebuilt in june of 08.
