SINGLE SCROLL Unequal Length Header for SUBARU EJ20NZKW stainless steel UEL header kit is now available for your Subaru Impreza. This header fits any EJ SINGLE SCROLL . Made from 304 stainless steel and includes half inch thick flanges. The headers have a special designed collector to give perfect flow into the U pipe providing faster turbo spool and increased horsepower. The header sold with the NZKW stainless steel u pipe. Installing the header will not only gain you about 15 wheel horsepower, it