isnt an s1 inlet spose to be a split design, where u can remove the top half of the inlet, for whatever reason u wud want to do that?? lol. like this:



thats what i always assumed an s1 manifold looked like, and as my inlet is a complete 1 piece item, i figured it was a normal s2 manifold??? im well confused now

and what the hell is a knock sensor? lol should i have 1? sould i be needing 1?