look around on the forums where their old engineers lurk, they dont design anything different, they just copy the best bits from other designs. not saying theyre crap, they just copy other designs and integrate them into one product. plus, extractors that produce the most power dont necessarily lead to a faster car, theres a lot more physics involved, and same length primaries dont quite take advantage of the physics involved. look around if you dont get what i mean. theres an NA s2000 that makes less power than j racing's supercharged s2000, but still performs better on the track and in straight line acceleration.

and asking why their copy would be so expensive is like asking why people pay more for gucci and armani suits, you pay for the name and partially the product.

their k20a headers are very basic in design with only a few if any antireversion steps, but to make the most power from a setup, you'll need 35+ inches of primary piping at least, which is something that only bisimoto seems to do.