WOW!!!! What a difference this makes on the pedal effort on my LS. I had them installed on 280zx about 8 years ago, so you kinda forget how much difference it really makes. I would recommend this upgrade to anyone who is even thinking about it to go ahead and not wait. I did this on Friday morning ( yes I wanted to impress at the meet on Sat.) along with another oil change. Did the complete flush with clean brake fluid. I used the synthentic fluid made by Valvoline dot 3-4.