Can a O2 system be installed on a set of Hadden Marine Cyclone SS headers, and is there a kit available.

i have a set installed in a set of stainless marine risers.i belive they are 15mm .they are welded in the riser about 1.5" above the flange of the riser.i use a botch o2 sensor from local auto-parts store.so ,i do not see why you could,nt install the same thing in yours.hope this helps.