Originally Posted by
neal.jarosz
Discontinued in 2010. Get a eurocharged tune and needswings cold air intake. That'll put you at about 250HP to the pulleys(211whp). Which at stock is 179whp. Should cost ya around $800.
Stock can be anywhere from about 160 to 180, they do vary quite a bit based on the car, ambient temperature, type of dyno and countless other factors. To say every XF is 179 WHP is off base.
Every car is a little different and some seem to have better luck with different mods (or they think they do based on the butt dyno). My tune and CAI made a very noticeable difference, and I did them seperately to make sure I could tell. The 74mm TB was not noticeable to me, but maybe on a dyno I picked up a few WHP...