It's not so much the cost of the final drive, I would imagine that to be way less than £100 it's the cost of stripping the gearbox to install it.

MTX-75 won't fit and has the same ratios as the IB5, it's just a stronger box.
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2011 Focus 3-door Zetec 1.6 TDCi.
Previous <img src="/images/graemlins/stemo.gif" alt="" />s - 2006 Panther Black & 2007 Red. Gone and quite forgotten <img src="/images/graemlins/lol.gif" alt="" />