So far I am very happy I chose ffr mark 4 kit. But I have come across a few things that became major problems that wouldn't have been a problem at all if only ffr had addressed them in the manual. The first problem I faced was the donor control arms. The tie rods made contact with the springs. This could have been totally avoided had ffr given measurements on where to drill the shock mounting hole. I drilled the hole just as they showed in a picture and that didn't work. I spent many hours redoing the lower control arms. The latest problem is the steering shaft is making contact with the motor. I didn't discover the problem until I have connected all power steering lines and everything else in the engine compartment. I was hoping to start the engine this weekend. Well after I discovered that the steering shaft was contacting the engine I called ffr about the problem and asked how I should fix it. The tech said oh you must have the 4cam 4.6 liter. Well when I ordered the car I said I was using the4cam 4.6. Now I'm looking at spending a whole day correcting a problem that could been so easily avoided. Sorry about venting to u guys but my wife won't lent me vent to her lol.