For vehicles with an 3" midpipes and an APR Catback Exhaust System, the APR X-Pipe is a must have. This upgrade creates a smooth transition between the two systems and integrates an x-pipe that reduces backpressure. This upgrade smooths out the exhaust note for a more refined sound profile while also increasing peak torque. Like the rest of the system, the x-pipe is constructed from T304 stainless steel, beautifully TIG welded, and includes all new APR slip clamps.. APR 13-18 Audi S6/S7/RS6/RS7 (C7) w/APR Catback Exhaust X-Pipe Kit. In-house design with world-class manufacturing and quality control. APR Catback Exhaust System X-Pipe - S6/S7/RS6/RS7 (C7). Fits 2013-2018 Audi RS7, S6, S7 with APR Catback. Dual 3" to 2.75" mandrel-bent brushed tubing. For use with 3" midpipes to and APR Catback. Argon-back-purged TIG welding throughout. Larger diameter piping compared to stock. T304 stainless-steel construction. Lower exhaust back pressure. Increased peak torque. Refined exhaust note. Integrated X-Pipe. 40T XPIPE KIT. Exhaust

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