I bought them used. No idea what brand they are. I've put maybe 3,000 miles on them myself. Figure $7.00 shipping to the lower 48 states. Got the 435's from Smokem. Havent even run the 435's yet, pullled my head to do a head gasket and my head's cracked. I'll be up and running next week, thanks to mumau's for hooking me up with a head. I'm switching turbos also to i cant really compare differences yet.