What is the easiest way to dramatically improve your Mx5? Swap out the steering wheel. The steering wheel is the main touch point in your Mx5 so changing it out can have a huge impact on your driving experience. The problem with swapping out your steering wheel is that up until now that cool Nardi or Momo wheel meant you lost your air bag. Enter Cipher Auto and their line of steering wheels that allow you to swap out your worn stock wheel for a real leather, flat-bottomed wheel that allows you to keep your air bag. The Cipher wheels diameter is the same as stock except for the flat bottom and the rim is thicker than the factory wheel for a better grip.. Instructions are included but we highly recommend professional installation.