It might if the car had/ has 170 bhp to start with but the problem with st170's is most of them don't make th power they are supposed to.

To be honest I didn't really notice any difference in power with the K & N or the exhaust. Although they make it sound better I don't think they do much else. The dreamscience map does make quite a big difference though worthwhile if you can get hold of a stratagem second-hand as they don't make them anymore although you can still get the maps put on at approved dealers.

I personally believe the best way forward with the st170 (unless you want to invest loads of money) is to improve the handling. Whilst they are not that quick in a straight line they perform well in the corners with a few choice tweaks.

al