Who wants AERO?

[Oz]

Can't help thinking that underbody aero is in the domain of the racer looking for that final few tenths, the type of person who can spend both the time and money to custom build for his application.
Front air dam/splitters do a very acceptable job of reducing the flow under the vehicle and at a fraction of the cost of a full underbody....with the advantage that they can be produced and sold off the shelf.
Unfortunately on an MX5 they will need to be readily available to be often replaced.