Hi, I have a Race Chip Pro 2 for a SLK 250 CDI (R172) that has now been removed prior to cars sale. Fully working, boxed with instructions. Cost new now is £249.00. Will sell for £80.00 UK only. Dramatically improves performance. https://www.racechip.com/chip-tuning/racechip-pro2.html I will be at 3rd South West AV8 meet 09/07 if anyone is interested.