From the web:

Sprint lowers 1.5/1.5" front and rear, 20-25% stiffer than stock

H&R sport springs lowers 1.4/1.3" front and rear, spring rate unknown

My questions:

1. What exactly are the numbers for 20-25% stiffer than stock? trying to compare to competitors like Tein S tech and TRD

2. Will springs listed for 2008 XD fit on 2009-2011 XDs?

3. does anyone have experience with these two products?


thanks!