Ive never used a GFB stealth but did they say why not to reuse the factory o-ring?
If the
bov outlet is the same diameter as stock, which i assume it is for the return hose to fit on, then i dont see why u wont be able to use it or shouldnt ..
edit: p.s Your talking about the 'clamp' ring that secures the hose onto the
bov right?