BSI RACING Spec Miata Adjustable Fuel Regulator 1999 – 2001 BSI Racing, Inc. » Product Catalog » BSI RACING Custom Products » BSI RACING Spec Miata Adjustable Fuel Regulator 1999 - 2001 Spec Miata adjustable fuel pressure regulator system. Featuring an Aeromotive Adjustable Fuel Pressure Regulator Price: $399.00