2,000 16V PSA

I needed to know how it would produce more power to a 2000 16V engine of 135 hp PSA, the truth is not bad, but if you could get any more it would not be more! They have given me some idea, polish admission, reduce cylinder head, change electronics and admission ... would it be reliable? Thanks in advance !!

Most of the work to be done is in the cylinder head if crusas cams can be obtained greater power, in addition to other things, atticing pistons, but none of this makes a lot of sense if you do not use the vehicle for running because the cost is high and the combustible consumption increases to considerately concentrate, you can modify it only with a bee.