Depends really as to whats been done.2 ways of doin them and thats the cheaper way and expensive way.Cheap way is to use a de-comp plate and use standard pistons expensive way is to get proper forged pistons rods etc and build it properly and also allowing more power and boost.All depends whats been done.Mines is a 1.8 ZVH with de-comp plate running 1 bar of boost with a stg 3 hybrid turbo,bigger pace cooler,high lift cam,stainless exhaust etc etc but i wouldnt expect it to be any higher than 180bhp but the torque would be over that i would expect but would need it rolling roaded to confirm this.Also for sale and im in scotland aswell