Just added rumble motors to my setup. The rumble on the gas pedal doesn't help a whole lot but the one on the brake has made a massive difference! I know now
SIM 3D Rumble Motor Kit Review By AussieStig - Bsimracing
Sim-3D Pedal Rumble Motor Kit - Sim 3-D Pedal Rumble Motor Kit - Gamereactor
SIM RACING rumble pedals for CSL Fanatec pedals by Jamie G | Download free STL model | Printables.com