DeutschTuning poudly offers APR Mid-pipe Assembly Without Muffler Audi RS7/S7 (C7) 12-18. The APR Catback Exhaust System is available with and without a center muffler. This upgrade is customers who have purchased this system and would like to replace the center muffler with our straight pipe assembly. T304 stainless-steel construction. Argon-back-purged TIG welding throughout. Dual 2.75" mandrel-bent brushed tubingugged and precise mounting brackets. Direct fit to the APR Catback Exhaust System. Low-profile design, suitable for lowered vehicles. Larger diameter piping compared to stoc. kDesigned, developed, assembled and quality controlled in-house.