Porsche 997 Carrera S gets quality Borla(r) Performance Cat-Back(tm) The Borla(r) love affair with the Porsche goes back many decades. Alex Borla(r) began his racing career driving endurance Porsches in Europe. The Borla(r) Cat-Back(tm) systems for the 997 model of the revered 911 Carrera S series is a perfect blend of exceptional performance and that exclusive Borla(r) tone. PN140234 Cat-Back(tm) features a full dual system which thanks to the lightweight premium high-quality T-304 stainless steel construction is actually more than 10% lighter than the factory single muffler system. This system is tuned for the non-turbo Boxster engine boasting an impressive 325cfm greater air flow while generating solid double-digit horsepower numbers and torque gain numbers in the mid-twenties. The 140234 system features four 3.5" Intercooled mirror polished T-304 stainless steel tips. The Borla(r) PN140233 Cat-Back(tm) system is similar but features the 88mm round polished T-304 stainless steel angle cut tips (two per side). Borla(r) the original pioneers of high quality T-304 stainless steel (superior to 409 or aluminized steel) free-flow exhaust utilizes patented award and race winning technology to deliver quality sound performance gains and enhanced fuel economy -- all with an easy bolt-on installation. And backed by an unsurpassed written million-mile warranty.