http://www.aus300zx.com/forum/showthread.php?t=267383&highlight=rebuild+hks+2530 you cant actually buy a 2530 core from hks. you can buy a 2860rs core and swap compressor wheels . the hks comp wheel is larger than the 2860 check out my thread about the same thing on twinturbo.net http://www.twinturbo.net/nissan/300zx/forums/general/view/2067923/HKS-2530-rebuild.html