Thanks for getting back to me! I do love my st170 and how it drives. They are crap on MPG that is really what i am looking at improving and if the added bonus of power comes then great! Justin st13: I have a half stainless steel system on mine with a k&n panel filter, my mate recommended getting the exhaust manifold and de-catting it along with a remap for the best benefits at low cost. I have yet to do this.

Think i'll steer clear of the major work like a turbo etc.

My mate warded me away from the online superchips and said he knew someone to do a proper remap on it. He said it would probably bring it up to the 170bhp mark as they all fall short!

Also an exhaust vernier cam pulley retarded at -8 is said to be a good mod too?!