I'm a researcher by nature. (Before I buy I spend too much time researching the product. But. . . that's my nature). I want a particular sound from my XF 5.0sc. Beginning with the Stage One from Spires and moving forward from there. Exhaust can be the most exacerbating upgrade on any car! SPIRES has taken the frustration of this upgrade out of the equation however. I've never had an exhaust upgrade go as easy as this one did. Perfect fit. No modification needed!
