Nothing wrong with a fiesta inlet if its been worked to fit a Zetec. Last week we mapped a Zetec Turbo on Fiesta manifold and ERST exhaust manifold with T34 Greys and 1.6bar boost. Made great power and had no issues with inlet or restrictions that people talk and make a myth about. Value for money and produced results.

Yes in an ideal world a proper computer aided designed and tested manifold would make an improvement but I haven't seen one made yet, as most people who make these haven't got the £100,000's worth of equipment to test it. Other than jenvey or mountune etc.