AMS Aluminum Crank Pulley
 

For sale brand new never used lightweight aluminum crank pulley by AMS, it will fit most cars with a VQ engine: 350z, 370z, G35, G37, M37, Q50, etc. Stock pulley is nearly 5 lbs, this is 1.45 lbs so a lot of rotational mass is shaved off allowing for a slight power gain. I've had a similar AMS pulley on my previous car for years without any problems, bought this one for another car that I no longer have so my loss is your gain, $140 shipped anywhere in US.