I fitted a similar product to my 156 JTD (5 cyl common rail TD)and was most impressed. Try www.dieselchiptuning.com/catalog/default.php
They are around £325 and in my case added about 25bhp and better drivability and economy. Took a matter of minutes to fit as well.
Before you do anything, I strongly recommend that you check with your insurers what the impact will be on your premiums. Whatever you do, don't chip the car and "forget" to tell them.
In my instance, my insurers were happy to leave the premium where it was, so you may not get stung.
Regards,
ND
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