I had both a T-Tuning box, and a DTUK Eco 3 box on my Vectra.
The T-Tuning one was just mental, and was only £70 from Germany
http://www.t-tuning.eu/
Just looking on their ebay site now, they have realised they were selling them far cheaper than anyone else, and put the price up by over £100!
http://cgi.ebay.co.uk/Opel-Astra-Zafira ... 5639f380e8
This is the DTUK eco3:
http://www.diesel-performance.co.uk/imp ... conomy.php
Had my Vectra rolling roaded @ Courtenays showing 185bhp, which is a more accurate measurement. The DTUK is fully adjustable with 11 power settings.
The CRD2 has different maps loaded as well
http://www.diesel-performance.co.uk/crd2.php
so you can choose how aggressive or smooth the power delivery comes in.
The new CRD-T not only increases the fuel pressure on the common-rail, but also plus into the boost controller, and ups the boost as well. These can see 215bhp
http://www.diesel-performance.co.uk/box ... .php?id=10