I'm talking specifically about the 1.6 engine on UK cars here. My understanding is: the 1.6 (115bhp) was available on the mk1 from 1989 until mid 1993 when it was replaced by the 1.8 Then it was re-introduced in mid 1995 but it had been detuned to 90 bhp. Then on the mk2 the 1.6 was 110 bhp. So I guess my questions are: Is everything I've said correct? In what way was the mk1 1.6 detuned to produce 90bhp? Was it just a map or was it hardware? Either way is it possible to get those horses back? Is the 1.6 in the mk2 the same 1.6 as in the mk1? Also, what are the differences between mk2 and mk 2.5s? Is it just a facelift or is there anything else? And which mx-5s have an LSD?