Like the topic says, its s Dc 4-1 header for a gsr, will fit b16's as well. Header is very clean, no dents or rust, used for maybe 8 months. Only reason im selling is i now have an itr 4-1. Header made good top end power on my b16. In my book best bang for the buck header. Looking for $200 obo, or any trades you guys may have.