Opel Antara 2.0 CDTI Automatic – Techworld-Chip

Hello, so far I’ve been a star driver, but after I’ve been disassembled my GLK, I’ve been reoriented. Not quite, but still I need a SUV again. Now it’s become an Opel Antara 2.0 CDTI automatic Cosmo. Great equipment except for sliding roof, floor heating and electric seats. It’s from 9/2007, 55,000 km of hand-washed and stapled retiree quality. The previous owner has had a chip of the company “Techworld” sold by FOH from 1 1/2 years. But after allegedly two months, let it be expanded again, because it has no effects. Does any of you know this chip? Should I have it installed again? The Opel dealer says yes and wants to have 25 € for it. Don’t know me with such things at all… Be happy about help as an “Opel newcomer” and also about other comments, assistance and tips on the Antara. Thank you very much.