IPD Competition Plenum Porsche 981 Boxster Spyder-Cayman GT4 NASA Discount adjust the rear tethers so

adjust the rear tethers so that there is ½” to 1” of slack

The Forgeline Wheels SS1R 5-Lug wheel is a one-piece forged monoblock construction

Hans anchor points are pre-installed for use with head and neck restraint systems

the VX1R starts as a one-piece monoblock forging

Soft-touch textile for feel and enhanced comfort

IPD Competition Plenum Porsche 981 Boxster Spyder-Cayman GT4 NASA Discount adjust the rear tethers soIPD Competition Plenum for Porsche 981 Spyder GT4 Once again, Porsche left the door open for engine performance improvements with the 981 Boxster Spyder and Cayman GT4. Using the same factory intake found on the less powerful 981 S and GTS models, despite using the 911 Carrera S 3. 8L engine, the intake's 74mm throttle body limits power and torque to keep the 981 from treading too close to the 911. As a result, Porsche's 991 Carrera S delivers 420 HP