Had a Miltech full system fitted myself about 4 months ago and had to do abit of cutting to fit the V6 4 Motion Vallance, When you line up the vallance befor fitting you will see just to the right of the exhaust you need to cut about 1 1/2 inches of metal off, I don't think the metal does anything so don't worry, I haven't had any props yet,
The tow bar wont sit in the right place either but don't worry just paint it black, or if your car is silver and you have the front and rear Vallances colour coded

like me then you do't need to worry about paint , It'l probably go un noticed.