By law, the GT3 and GT2 RS models destined for the US aren’t given the option for Porsche’s factory-installed harness bar. This is due to regulations involving non-deformable objects present in the car’s cabin in the event of a crash.

Fortunately and predictably, the aftermarket stepped in to fill the void. In this case, it’s BBi Autosport.

Their Street Cup harness bar–a bolt-in, 2-piece design–is TIG-welded from high strength seamless tubing. It utilizes an strong “X” brace design for both front and rear sections inspired by Porsche’s own motorsport program.

In just a few hours time, US-spec GT cars can be ready for safer trips to the track and a sportier presence on the street.

991 GT3 RS BBi Street Cup harness bar | Manhattan Motorwerks
991 GT3 RS BBi Street Cup harness bar | Manhattan Motorwerks

With the seats, rear seat delete and rear carpeting removed, the BBi Street Cup harness bar is ready to be bolted in. The rear section swings in place first, held down by two bolts on each side, with a factory guide pin on each side to help get it in place. The trick is to not fully tighten the bolts so as to leave in some play for the upper joint when the front section goes in.

991 GT3 RS BBi Street Cup harness bar | Manhattan Motorwerks

The larger front section takes extra caution to thread into the cabin, but with two people its base brackets settle into place. Using the play left in the rear section, the upper joints of both halves can then be seated together. At this point the bolts can be torqued down tight.

A few cuts are required to the rear carpet as well as the seat delete in order for the bars to pass through. By double-checking measurements and being cautious not to remove too much material, the result is a clean installation that gives this GT3 RS the added safety and function it was missing. The yellow powdercoat matches the factory-optioned Racing Yellow seatbelts and signature Racing Yellow calipers of Porsche’s carbon ceramic brakes (PCCB).

991 GT3 RS BBi Street Cup harness bar | Manhattan Motorwerks
991 Porsche 911 GT3 RS | Manhattan Motorwerks

Now that the harness bar is in place, all that’s left is the installation of the Schroth Racing harnesses for both driver and passenger. But that will come another day, once the customer is ready to hit the track.