Front Adjustable Sway Bar Fits 07-13 Porsche 997 Turbo Agency PowerAgency Power Front Adjustable Sway Bar Porsche 997 Turbo 07+. In the quest to create the most well balanced suspension for the 997 Turbo, Agency Power has developed these sway bars to our specifications. The all wheel drive Porsche turbo cars naturally have a lot of under steer. Under steer is when you take a turn but your car keeps going outwards. With an AWD car, getting the rear end around can be easily done with a larger sway bar. However you do