I bought this car a couple years ago and after scraping the front end on minor bumps and dips, I got under the car and found that there was no undertray! Why the heck didn't I see that on the prebuy? Dazzled by JRG paint , I guess. Anyway, I installed a new undertray a while back and the scraping diminished greatly. So did the funny "something flapping in the breeze" sound. Still, the front was about 1.25" low. With about 56k on the car I wasn't ready to believe that the springs had given up. My old XK8 with more than double the mileage and was at the correct ride height on the original springs. Yet, as so many on the forum have had to replace springs I figured it was in the cards.
The car began to get a bit dodgy on uneven roads and I knew it was ready for some new parts up front.
So, this weekend I replaced the front springs and upper mounts (from SNG Barratt) and installed upper A arm bushings from PowerFlex. The ride height is now at spec and the car feels great. This is my first experience with urethane bushings and it feels really nice - firm but not harsh in the least. I'm interested to see how they do over time.

 

Which color PowerFlex did you go with?

 

Purple

 

I have the purple PoweFlex bushings up front on both lower and upper A arms. I would echo the firm but not harsh description. Really tightened up the feel and steering.