a N/A starlet means that its a non turbo (Normally Aspirated). all the uk spec ep91 (96-99) N/A starlets came with the same 4efe engine, so there is no performance difference between them. the only thing that varies is the spec, for example my old starlet 1.3i had the same 4efe engine as all other n/a starlets but had no power steering, airbags, electrics, alloys, spoilers etc. most sportif's come with a few extras (depending on year and spec) such as power steering or an airbag and maybe a rear spoiler. the sr and gls are the top of the uk spec range, the sr coming with a revcounter, alloys