more or less the same...maybe a little less because the b16 head breathes better than the b18s so it will allow for more feul.

btw...boost that bitch

 

is it possible for me to make this thing pass smogg if so what is required?

 

im thinking its a b18b, or a b18a, right? mileage will probably be around 25-26 city, and about 30-40 highway. but those motors are not known for reliability (with the head swap, not the stock b18a/b) but for a grand, its tough to pass up. and the turbo isnt as good and idea as Nail Bunny thought, as he was likely thinking it was a b18c1. oh, and I seriously doubt it will pass smog. the last guy I knew who took one in for smog, got laughed out because it was so bad it was considered a "Gross Polluter"

 

lol