Other major changes for the new ‘Spider’ that are expected to make it to production will be additional air intakes located behind the seats as well as a pair of safety roll-over bars. The placement of the fuel filler cap will also be changed due to the missing rear pillars, while changes under the sheetmetal will likely include extra chassis strengthening.
While the base model will likely stick with the hard-top’s 420hp (313kW) 4.2L V8 engine, there’s talk that Audi may shoehorn the 5.2L V10 from the S6 and S8 sports-saloons into a mid-level model and reserve the 5.0L twin-turbo V10 from the RS6 for a high-performance RS-variant.
The differences between the RS-variant and the standard V8 model will extend beyond just horsepower outputs. The chassis has reportedly been modified to accommodate the extra power, gaining upgraded suspension, steering and braking systems.
Source: Motor Authority