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Indeed, the technology is too expensive and sophisticated for a prospective A3 coupe, but the engine is a plausable powerplant for the next TT-RS. The use of Aluminum will inevitably trickle down the range -- the RS-models especially could benefit from weight loss. CF on the other hand qould require the industry to increase the production of the material to make it more economical to use in passanger cars. Unlike metal or aluminum it cannot be knocked back to shape, making it very expensive to replace. Fest your eyes on the price tag of this SLR CF bumper:
MERCEDES SLR722 SLR MCLAREN front carbon fiber bumper : eBay Motors (item 270596251075 end time Oct-18-10 01:30:54 PDT)
The engine's potential is quite huge in fact and I am quite sure that Audi will run this unit up to 470-480hp in production form without any worries of reliability. You are right that aluminum will become widely used in Audi models, their goal is the be lighter than the competition, a goal I am sure they will achieve. As for the use of CF, I believe this will become much cheaper to manufacture and in the next 10-15 years it will end up as cheap as alloy but their is still the issue of repair to be taken into consideration so I doubt it's use will trickle down to the masses and will remain the reserve of the more luxurious and expensive models.
