shadowface

Yeah, it is, although I like reading reviews on websites such as Parkers, or tech data from BMW or AutoTrader. A quick data comparison could save you a lot of headaches! In regards to the engine power, the same goes for diesels: 116d is a 1.6l diesel and 118d, 120d and 123d are all 2.0l diesels. The main difference between the former two and the last one (123d) is that the latter is twin-charged (bi-turbodiesel), so it has the biggest potential when it comes to remapping. Edit: Corrected the facts about differences between 120d and 123d.

Cheshire sounds good, I'm up for it. I'm from Altrincham BTW.

The 116i is a 1.6l petrol engine. In contrast 118i and 120i are both 2.0l, but most probably (I'm not a BMW engineer) with a different ECU mapping installed, which downgrades the engine's overall power (on 118i) in relation to the higher spec unit. The 116i is a different matter, as it comes only in one flavour, depending on the year.

If you are still on a look out for new tyres, the RFT/non-RFT is a personal preference, although BMW advises not to use non-RFT, since the suspension, wheels and puncture sensors where calibrated to run specifically with the RFT tyres. You cannot do any damage, but be aware that without a RFT tyres, once you get a puncture, you might be left stranded on the hard shoulder or worse, unless you get a spare/inflation kit. Modern RFTs can get you home safely even if you're 150 miles away (unless you drive over 50mph with a puncture), and even if you have literally no pressure in the wheel at all. I think the price is worth the convenience. Plus, the RFT drive is much nicer for me, personally.