Here's something for when you run out of things to do to your TDI (spotted at the Brickyard forum)

I went to the Autosport Racing car show on Saturday at the NEC Birmingham.

Was checking out a Corrado on Nitrous Oxide Supplies Ltd stand.
2.0 Tdi with Superchips remap and nitrous injection.
They were quoting 270 bhp with the giggle gas.

All it is, is a nozzle added that sprays N2O into the intake.
The ECU will recognise an increase in oxygen intake via the exhaust O2 sensor and will
send additional fuel to the injectors to supply the engine.
Instant 50 bhp increase - just don't get any greedier than that