Love the throughty sound of 2007 XK but is there a simple way to make sound even better?

 

high flow cats.

 

Custom cats not that simple with R&R of O2 sensors. Easiest’s changing the rear back box or the mid section delete resonators and replace with X-pipe.

 

XKR back box; easy mod, if you can find one. Noticeable under acceleration, unobtrusive when cruising; I've done this with my 2007 XK. Next step would be a mid-pipe mod - H-pipe or X-pipe; I don't know how it would sound with the resonator removed

 

X pipe will change the sound completely giving it a higher pitched tone