Akrapovic 991 / 911 GT3 / RS Slip-On Performance ExhaustONLY AVAILABLE WITH TITANIUM EXHAUST TIPS (Included) Akrapovis Slip On Line represents the first step in the exhaust system tuning process and the muffler can easily be installed onto the Porsche GT3s original system. Built from hi grade titanium and finished with two eye catching double round tailpipes, this entry system makes the GT3 more powerful and lighter, and gives the car that unique Akrapovi sound, while still meeting ECE specifications.