I made up my set of Ultra40's years ago and Matt bought a set of Firecores last year. We are both very happy with both sets of wires. I would probably try Firecores but my big issue is I have to get them from a dealer and pay tax, then you add in shipping costs and being an old school racer those added costs add up real quick. Where as I call Summit and pay no tax, no shipping, and they are on my door step the next day. Sooner or later the right circumstance will come by and I will probably try a set.