my car has had a 2.0zetec lump put in it,was wondering if the heads on 2.0 zetecs and the head off the RS1800 zetecs are the same

also im after a stainless exhaust system,and a 4branch,where would be the best places for these

also best airfilter

also will st170 calpers and discs fit under 16' wheels

cheers