I have Kooks LT's and a lowered car 1.5 all around and 255/45 tires, I have had a rub over steep driveways and over one speedbump. my driveshaft rubbed the first time and the x pipe the second time, but if you treat your car right and drive slow over those obsticals you will alright.

 

I have dynatechs on a lowered car, no issues at all. Tuck up under there nicely