Stainless Works 2011-14 F-150 3.5L 3-1/2in Catback S-Tube Muffler Factory Connection - FTECOCB-LMF Downpipe Back 25-percent increase in core volume

25-percent increase in core volume for improved heat transfer

Since RS4 units were never intended to be used on the US S4 chassis

100-500 Deg F Optimal Temperature Range

GMC C4500 Topkick 2009-2004

A ground-breaking octagonal shape has been fashioned from lightweight titanium with a carbon-fibre outer sleeve

Stainless Works 2011-14 F-150 3.5L 3-1/2in Catback S-Tube Muffler Factory Connection - FTECOCB-LMF Downpipe Back 25-percent increase in core volume2011 14 Ford F 150 Ecoboost 3. 5L for up to 156. 5" Wheelbase. All tubes are CNC mandrel bent for optimal flow. Made from 304 stainless steel for maximum corrosion resistance. 3. 5" catback exhaust with S Tube Turbo Muffler to fit forward Factory Connection point. These are TIG welded for strength and durability. These kits come with a lifetime warranty and proudly made in the USA.