I can't find veggie chow mein (someone else will do, no doubt) but beef & chicken are below (EE, Original, Green)
Chinese Restaurant, Beef Chow Mein, average portion, 450g serving 8½ 13½ 8½
Chinese Restaurant, Chicken Chow Mein, average portion, 380g serving 7 11½ 7
So veggie chow mein can't really be more than 7 syns, can it?