Absolute Motor Specialties (AMS) Canada started out as a company that copied others' designs and products essentially pirating others' development and producing sub par parts moslty manufactured and drop shipped from China. They have been in business for some time now but whether they have spent any resources on actual development and testing or if they are still the pirates they once were I couldn't tell you since I (as well as MANY others in the Z32 community) stay away from anything AMS like its the plague.
DO NOT confuse them with AMSPerformance from Chicago (the guys that build 1000+ HP Lambos)
Check out this site if you would like a history on AMS Canada:
http://www.amspirates.com/