The $200 SpeedDaddy headers seem to be what everybody wants since they are stainless and cheap. If you could develop headers that were superior to those and close in price, you could have a winner. The problems I have seen with the SpeedDaddy headers are the sink trap in the down pipe, the flex section is cheap (should be an interlocking flex) and the crossover does not line up well. I agree with Bio that the S&S design would be a good one to copy instead of the SLP headers that SpeedDaddy copied.
