This German company offers a tuning kit to enhance the performance of your Cayenne Diesel. This website writes a positive review of the tuning kit, but adds that it would have been better to see some external styling upgrades as well:
RUF Tuning For 2010 Porsche Cayenne Diesel – Mibz.com
We enjoy a good power boost just as much as anyone, but some exterior modifications would have been nice to see on the Porsche. RUF tuner has decided against those types of upgrades at this point, but we are hoping they will add a bit …
Publish Date: 08/31/2010 1:08
http://www.mibz.com/20574-ruf-tuning-for-2010-porsche-cayenne-diesel.html
Diesel Porsche =I
Author:austrianpsycho