My cousin has bought a Y plate 2.0 8v gti MK4, silver and very nice!!

Modding wise he wants to keep things simple but is looking to upgrade the rims first. Buying some 16" rims off ebay they are 6.5J offset is 42

Seller has recommended a deal with 205/55/16 tyres for these. but he wants the rim to look bigger compared to the tyre and more sporty and would prefer for example a 205/45 tyre. Just wanted to ask you VW pros. on here, would this be suitible for a MK4 golf or will he have any problems, maybe dodgy speedo readings?

Thanks guys!!