I like this topic, as I'll be considering this in the future too.

Are you sure you want to keep 1st gear? I find it useless! its far too short and if I boot it in first all the way to the redline the engine moves so much it knocks the intake pipe off. Personally first is the gear I'd change. 2nd is fun though

IS it just a case of using any diff that will fit the IB5 box?

Adam01 - what do you mean you cant get anywhere near 200? the box wont take it or the engine wont produce it? if its the latter, i tend to agree.

JAmes.