OK that's good, so as long as I keep the differential mounting points, I should be able to change things around later once the thing is up and running... I have a Torsen diff on the Mazda... :)
I believe I should be able to shorten (or at least have shortened) the half shafts...
If you don't mind me asking, what mods have you got to handle 600Bhp?? That's gotta be quite a machine!... I will be at JAE with my RX, so perhaps we can have a chat.
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You can get the is200 sport differential/subframe for an easy start, this comes equiped with a Torsen © Differential unit, however there are quite a few aftermarket differential units that can be got for around 500 quid which are far far better, like TRD or Cusco or as i have KAAZ which can be either 1.5 or 2 way lock up units.
you should be able to narrow the rear subframe, however the problem will be the drive(half shafts) will also need shortening.
there are also lower, and higher final drive gear ratios available by chopping and changing from Manual to Auto final drive ratios
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