This BORLA(r) Cat - Back(tm) system is tuned for performance and sound for both the 2.0L engine in the WRX and the 2.5L engine in the STI. Our S - Type sound level is designed to bring out the Subaru Boxer engine rumble and provides an aggressive sound without the drone. This system features 3.5 quad high temperature black coated T - 304 stainless steel tips, but is also available with polished T - 304 stainless steel tips. For ease of installation, this Cat - Back(tm) is a direct bolt on part and does not require cutting. Like all BORLA(r) exhaust products, each system is handmade in the USA by master craftspeople and features premium, high - quality T - 304 austenitic stainless steel construction, ultra - smooth mandrel bent piping, and a Million - Mile Warranty.