Something else to think about... A DTUK box on a 330d X-Drive will give just over 300bhp and 660Nm (486ft lb)!
And lose your warranty. Not worth it IMO.
Anyway, the 330d xDrive is a seriously fast car, 0-62mph in 5.3s. Midrange acceleration is phenomenal with all that Diesel torque. The car is fast enough but the handling is a bit roll-y poll-y.
Driven the RS3. A bit wooden and nose heavy compared to the R, but accelerative performance is in another league. It feels like a battering ram. The 5cyl engine is a peach. Ride is a touch hard on our broken tarmac even in comfort mode. Car looks fantastic and is beautifully put together. Love it except for the price.
The R is also a seriously fast car and its ride and handling are spot on IMO.
GTI/GTD feel and are slow in comparison to the above. Scrabbling FWD cars.