The COBB J-Pipe replaces what is traditionally referred to as the "downpipe" on previous Subaru vehicles. With the relocation of the turbocharger for the 2015+ WRX CVT and 14+ FXT, the first section of exhaust no longer requires a downward turn but instead uses a sharp "j-turn" to route exhaust towards the back of the vehicle. During testing, we discovered when running a stock cat-back with an upgraded J-Pipe, there was a resonance issue when cruising at highway speeds. Thus, we have gone a step above and beyond to offer a resonated version to our customers that want to keep their stock cat-back. You can also use the resonated J-Pipe if you want to quiet down the turboback system! Requires Custom Tuning
COBB initially took a conservative approach with CVT equipped Subaru WRXs and Forester XTs, offering an Accessport with only Stage 1 OTS calibrations. We have kept a watchful eye on the CVT enthusiast market over the years and have noticed a recent increase in CVT tuning requests for parts beyond the Stage 1 level. Through careful torque limitation in the engine calibration, we believe it is possible to safely increase the performance of CVT-equipped cars beyond Stage 1. COBB CVT J-Pipes are now available for those customers interested in upgrading. Custom tuning is required for the time being and COBB Off The Shelf Maps will be offered in the future.