Chipping 2005 W203 C220

Hi,

I'm thinking of chipping my 143hp 220 CDI W203 Auto to get 170hp and 370nm of torque plus better fuel consumption in normal usage. I'll probably using one of additional chips such as

or a Brabus D3(III) or something in between those prices, rather than replacing theactual factory fitted CPU. (As you probably guess I'm in the UK). Does anyone have any recommendations as to a reliable supplier and what to avoid?

Thanks

Richard See

where my caravan's for sale.