Just to add another variety, a different SSR design, getting rave reviews in the states.
Just under $1000 excluding tax and shipping.
And some prices from Dragon2modz (all inclusive of VAT)
Spoon Sports 4-2-1 Exhaust Manifold = List Price : £732.33 each. Discount Price : £711.69 each.
Toda Racing Exhaust Manifold List Price : £651.72 each. Discount Price : £641.24 each.
DC Sports Manifolds =
4-2-1 Ceramic Street & 1 Piece = List Price : £254.48 each. Discount Price : £235.63 each.
4-2-1 Brushed Stainless Steel Street & 1 Piece = List Price : £379.40 each. Discount Price : £351.04 each.
4-2-1 Polished Stainless Steel Street & 1 Piece = List Price : £455.06 each. Discount Price : £420.94 each.
4-2-1 Ceramic Race & 1 Piece = List Price : £313.40 each. Discount Price : £290.07 each.
4-2-1 Brushed Stainless Steel Race & 1 Piece = List Price : £394.53 each. Discount Price : £365.02 each.
4-2-1 Polished Stainless Steel Race & 1 Piece = List Price : £482.58 each. Discount Price : £446.37 each.
Mugen Manifold List Price : £1,274.10 each. Discount Price : £1,234.78 each.
Discount based on group buy.