ok ill put you off a bit inspection 2 service £1000, front disks £350, ceased calipers are common, the brakes suffer from fade quite easily when pushing on, tuning these engines are pretty pointless unless you are going the supercharging route (about 8k for ESS VT kit) where as you could easily spend 4k on the best selected engine mods and would only make 30bhp tops, also dont think that the Z4m will be any quicker than a well tuned GTI, if anything id say the gti feels quicker
Although TBH all the above are pretty poor excuses not to buy one of the best looking cars ever produced, with an ace engine and exhaust note, amazing handeling and blistering pace. Id have one in a heatbeat,