Wotcha and welcome - loooovely motor but I do love a hatch
yup the 340r is an alternate to the 330s but achieves the same result - I believe it cost about £1500 for the upgrade and involved an ecu remap and exhaust system change - possible air filter as well.
not sure about the suspension and wheels - bang up some pictures of the wheels and we can shine some light.
either way you have (IMO) a very desirable car and it Im sure it will bring a smile for many miles, we have a few hatch threads knocking about with bits of info. It has been found that fuel economy is better in sport mode than the default intelligent mode - see what you think, also 99ron is the way to go I got better fuel economy straight off using that.