This is a replacement for the restrictive factory midpipe. Fits the 99-05′ NB cars. 2.5″ mandrel bent tubing to provide a increase in boost response and quicker turbo spool. This midpipe is available with a ultra high flow metal core cat for lowest possible restriction. Fits all factory cross-frame bracing. A resonator can be added for those looking for “stealthly” turbo set-up.