ST-3 is just with all the options, all have the same engine. But most just go for the ST-2 and spec the satnav if they want it. You don't get the "style pack" free any more (since 2015) either, so you'll want that for rear tints and illuminated stuff plates etc
The Mountune kits add performance. You can have MP215 from new fitted by the dealer if you want, it' worth it since it improves the power curve quite a bit. It's warranty friendly, the higher ones aren't though.
The Mountune kits add performance. You can have MP215 from new fitted by the dealer if you want, it' worth it since it improves the power curve quite a bit. It's warranty friendly, the higher ones aren't though.