I have surfed this board for few days now attempting to educate myself in the area of potentially increasing the current 215 hp in a 2004 XF, and I am impressed with the quality and quantity of posts addressing this issue.

I have couple of questions due to an information overload-
1) is it realistic to at least add/increase an additional 20 hps? lots of debates and brain-storming this issue (almost as if it is a theory).
2) when referring to performance upgrades by Kleemann, Renntech, Powerchip, Evosports, what is the cross reference info to match the motor in the crossfire with the M-B motors they cater to? Upgrading crossfires is not mentioned in their web sites.
3) is there a solid / proven combination of products that can seriously improve the current stock performance of these cars without having to advertise one of my kidneys in the black market? exhaust system, chip? no turbos or superchargers. Something tangible! not just the "it feels better than before with that new chip"!
4) i build / ride high performance american motorcycles, I am aware of the power / cost ratio and the element of being realistic with what really works. Any feed-back will be greatly appreciated. I am currently shopping for a sporty car and the Crossfire is on the top of my list at this point, I have test driven several (TT quattro, S2000, Z350 and G35), the Crossfire remains on top. Thanks.