its hard to tell, milltek say about 10%, so thats 10bhp on our cars. but i would say 7bhp max.i bet AMD must have charge him a pocket full!! im considering getting a r32 exhaust, but i am unsure if it will fitt on to a 1.6 because the fuel take seems to be in the way for the exhaust box? also does any one know how much bhp you gain from the miltec r32 exhaust??