Audi A7 3.0 TDI competitionAudi is marking 25 years of the TDI turbodiesel engine with a special edition A7 Sportback 3.0 TDI competition.

The 3.0 TDI biturbo engine produces 326hp courtesy of changes to the charging system and camshafts; that’s 7hp up on the standard car. But that’s not all…

Full acceleration activates a ‘boost’ function that delivers an additional 20hp on top – that’s 346hp! It also produces 479lb ft between 1400-2800rpm, which is enough for the big A7 to reach 62mph from rest in 5.1 seconds.

It also averages 46.3mpg and emits 162g/km CO2; in time for 2015, it’s Euro 6 ready.

Naturally, the special edition Audi has received a suitably ‘competitive’ makeover, which includes fitting the S line sport package as standard. This lowers the body by 20mm, adds 20-inch wheels and 17-inch brake discs with red calipers.

Audi’s only offering it in Daytona Gray, Nardo Gray, Misano Red or Sepang Blue: all have black door mirrors plus black gloss package including high-gloss black tailpipes.

It’s largely black inside too (even the Beaufort wood is black), although Audi will offer an S sport seat with contrast stitching in Misano Red or Agate Gray.

The new Audi A7 Sportback 3.0 TDI competition can be ordered from August, with deliveries beginning in the autumn: prices have yet to be confirmed.

If you can’t wait that long, why not go back to 1989 and buy the first Audi TDI, the Audi 100 five-pot? You’ll probably have to search a bit; we found an honest-looking L-reg 2.5 TDI on eBay, with a highest bid of £255 at the time of writing. No competition to the A7 competition, but at that price, a nice way of bookending the Audi TDI quarter-century celebration.