I'm not sure what to think between the two really......IMO, the 181-185's havent proved anything significant over the 178's as stated. I know im running 100ft above sea level, but I honestly believe im two mods away(Meth and maybe NW manifolds or SC pulley) from being well into the 11's on streets. Just a few weeks ago in 85deg heat i was running 12.2's all day long. I believe Jeff is the first to break into the 11's without NOS. Posted on dragtimes. Nice job Jeff