K-Tuned 409 Series Header 4-2-1 K-Swap Budget Header - 88-00 Civic / 94-01 Integra

This header is capable of making very good power on relatively stock or mild engine setups. The main focus while designing the K-Tuned Swap Header was to blend excellent fitment, high quality construction and keep the price reasonable. K-Tuned has upsized the primary piping slightly and improved the quality of all transitions to improve exhaust flow. The primary to secondary transition now uses an expanded secondary pipe at the joint to eliminate any restriction. The secondary pipes have also been changed a little and now merge together better at the collector. The header is constructed with 409 steel with 3/8' thick flanges that are double welded and then ported for optimum flow. The piping is extra thick for added strength and to allow better weld penetration. These strength features add longevity and make a header that will be able to take the abuse of a firmly mounted K-swap engine. The strong interlocking flex-pipe can handle a lot of heat and has a 2.5' ID (Inside diameter). It f