Hyperflow is proud to release the new Subaru 2011-14 WRX/STI Sedan Quad Tip Touring Catback Exhaust System. The exhaust is a completely new system that has been designed around our brand new Touring Muffler. The Touring Muffler features our new Volume Tone Reduction (VTR) specification. The VTR specification maintains and enhances the exhaust tones you love but while eliminating the rasp and drone you hate in a performance exhaust system. These new mufflers maintain a straight-through design that aids in exhaust gas flow and maximum power potential but keep sound pressure levels reasonable at idle and while cruising. We achieved this by more than doubling the internal volume of each muffler compared to our previous WRX/STI sedan mufflers and by utilizing a propriety quantity and blend of packing material in each muffler. The overall result has to be heard to be believed- enjoyable melodic tones of the Flat 4 Boxer engine at idle and cruise with none of the rasp and drone that can detrimental to the driving experience.