My comment about the Focus Central header being the incorrect firing order was based on what I had read on FJ in their SPI aftermarket parts & mods list.
"focus-central has made the first spi focus aftermarket race header but it has the wrong firing order! However there is no other option except the escort gt header which is alot of work. Wrong firing order or not it has proven to be a worthwhile mod." post by Gigaherz
Panties aren't the best thing in the world but they are next to it.
I would rather drive the slow car Rusty built than the slow car I built.
Do your own repairs, it's not rocket surgery !!