REMARK Catback Exhaust. Subaru WRX VB - Dual R1 Spec Stainless (Non-Resonated)DUAL Exit R1 Spec Double the awesomeness of our R1 Spec. One of our most aggressive looking systems for the 2022+ WRX. Features dual R1 Spec muffler canisters with 4. 0 inch slant cut tips. Designed and manufactured for the performance minded enthusiasts. The R1 Spec features 3" mandrel bent piping, and high flow straight through muffler design. Non Resonated midpipe This system is offered without a resonator located on the midpipe. The two 150mm O.