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Our D Series Tubular manifold replaces the restrictive standard cast iron manifold and improves exhaust gas flow thanks to its stainless steel, CAD-designed construction. You will also benefit improved throttle response and increased power output.Features: Constructed from T304 stainless steel 4-2-1 design (offers greater mid range gains than a 4-1 design) 2" bore collector TIG welded Boss fitted to accept lambda (O2) sensor Improved throttle response and gas flow Direct bolt-on on fitment to standard catalytic converter or aftermarket decat/sports cat Gaskets included