specs:
10kg front, 8kg rear. We are working with m7 for an adapter to use for the rear springs so we can offer them with Swift springs in the future.
M7 Super Street Performance damper kit was designed for drivers seeking improved handling both on the street and at the track. Includes both ride height and 35 level damping force adjustments to allow the driver to dial in the suspension for various surface conditions. M7 highest quality performance damper is proven on circuit at GT race, drift and drag race.
For those of you that are not aware of the company, they were established in Japan back in 2005.
They have Max Orido, Tanaguchi, Dai Yoshihara, Odi Backis as sponsored drivers but they also test products for M7 before they release them. Real race car drivers at closed circuit courses basically pushing the car to the limits and giving M7 feedback on the parts good or bad to make sure they can change it before selling it to consumers
for the 370z
they also make :
intakes, exhaust, oil and rad cap, they also have racing oil(i love it on my boosted g), oil cooler
check out
M7 | Advanced Performance