JCR Titanium Race Pipe (Non Silenced) - 992.1 GT3 / GT3RS / STIntroduction From the 991. 1 GT3 to the latest 991. 2 GT3 RS, the factory exhaust system is somewhat a compromised piece. Porsche have engineered an exhaust system which will meet the requirements of each and every customer, from the every day driver to the most avid track day fan. The introduction of WLTP regulations have seen the introduction of OPF (exhaust particulate filters) into the latest generation of cars with the 992 GT3 RS models being no