Momentum Performance never made a 370Z kit. They are now out of business and do not exist. Their one and only kit was designed and intended for a 350Z/G35 DE platform. S&R makes their own single turbo kits for the 370Z. They may be modifying a Momentum Kit to fit the 370Z, but it is definitly NOT specific 370Z kit.
If this is the kit you are referring to it is a "S&R" kit...
not Momentum.
http://www.sandrperformance.com/SR-3...it-_p_897.html