i have problem helix downpipe gasket. what kind of gasket do u use on the downpipe flange where it mates to o2 housting?
i try to use 3''gasket , it just dont fit in there due to large flange.
help please? use high temp silicon?

i bought the downpipe and there is no hardware and gasket ,,(nothing) is it normal?

 

RTV for High Heat Application

 

i called and they say i need to use stock donut gasket , no need high heat silicon.
well i guess i need to believe what he said