The new Borla® cat-back systems for the 997 model is a perfect blend of exceptional performance and that exclusive Borla® tone. 915994 Cat-Back? features a full dual system which, thanks to the lightweight high quality austenitic stainless steel construction, is actually more than 10% lighter than the factory single muffler system. This 2 ¼" system is tuned for the non-turbo engine, boasting an impressive 325cfm greater air flow while generating solid double-digit horsepower numbers and torque gain numbers in the mid twenties. The 915994 system features four 3 ½" Intercooled, mirror polished stainless steel tips. The Borla® 915993 Cat-Back? system is similar, but features the 88mm round polished angle-cut tips (two per side). Cat Back Systems Now Available for both 3.6 and 3.8 Liter Engines!! Learn More