Does anyone know if it is a straight swap apart from mix & Matching the driveshafts.ive heard they are a lot stronger is this true? can i fit a lsd from an s2 box into this???? a friend of a friend said he fitted 1 to his mk6 escort and he said it is crap.. he said at 4000rpm he's doing 75mph!!!!! does every1 experience this or are there diferent ratio boxes out there??