I buy so much shit I cant remember.
Theyre 1 5/8. I wasnt sure.
http://store.summitracing.com/partdetail.asp?autofilter=1&part=BIG-32104FLT&N=700+4294908331+4294840126+4294908282+4294924927+4294839039+4294799365+115&autoview=sku
Ive got better things to spend a grand on than headers. I need heads.