Webby, by far the cheapest and easiest way to approach 200bhp from a 2.5 (for UK owners at least) is to pop in a 3.0l lump, and AR35.
I can absolutely, categorically tell you from personal experience that a cammed, superchipped 2.5 is not even in the same league as a bog standard 3.0l. Not even close. You may get a (claimed) 180+bhp, but only when screaming the nads off it.
Kevin Wood - I did once compare a 2.5 (from a 2000 car) to my 3.0 (1998) factory chips, and there were differences (and similarities). Whether that was age related, who knows?
I've still got the 3.0l chip (as its in the Bullet's glovebox), but lost the 2.5 chip in the garage. The laptop I had copied the maps to was also in the garage.
Webby - happy to take a copy of your current chip, and compare to my factory MV6 one.
I think I gave my Superchips 2.5 chip to Matchless, not sure if he still has it, or more likely sold it in an Omega.