Hi lads, ive got a 2litre 8 valve nova that im building which will hopefully be on the road by november ish time. Ive got a magnex 4 branch that i had with my new engine. I was planning on making a flange of sorts and buying a full magnex system for it but i thought id spare myself some money and make one. First question is what grade of stainless is ideal? 409? 316l? ...another question is how can i identify what grade my manifold is, or what filler could i use that will work? It doesnt have to be expecially strong as it will probably just end up being two tacks to hole the flange. Any advice is welcome! Brad.