So there is a confession to make here. We caved and bought a LSD off eBay. The Shazda came with an open diff - and whilst probably fine, Matt wanted this car to be a 'performance machine'. We just couldn't get our heads around how expensive the Torsen's have gotten, hence why we hadn't rushed out to buy one straight away.

A few people we had talked to had said it's worth doing it now because it's a bugger to swap once the car is built around it, so that was the deciding factor. Looking back now we are glad we don't have to try to retro fit it!

'Pro' tip - take your time marking the diff up and getting it centred and straight. Bear in mind the awkward angles you have to mark the holes from etc.

Measure once, cut twice didn't apply here, we ended up having to drill the holes in the chassis out a tiny bit bigger than planned after a foul up with the marking of the holes. We had marked them whilst holding the diff up to the mounting plate but of course it was going to sit lower once properly installed.

Generally though, this went pretty well and the locating holes in the lower chassis diff bracket really helped.

We got a bit hung up over the gap between the top bracket and the top of the diff. People seem to have quite large gaps but we didn't. After a discussion with GBS, it seems Mazda changed the dimensions of the diffs approximately every 3-5 minutes, so they all end up mounting differently.