The recent addition of extra power caused my Sierra RS cosworth LSD to slip as the power was applied i could feel it lock but then gave out at 200BHP mark around 5000rpm and would not hold for the rest of the revs, so the remainder of the track day i had to feed the power on steady until 5th and 6th gear. I did some research heard lots of bad press about quaife lsd witch is £1000 and lots of machine work to the diff casing to get it to fit. I then found a company called bara motorsport who can pump up your standard LSD they use thicker silicone grease and 44 new friction plates, they did the work wile i waited and dynoed it to check the friction, it cost me £260 witch was well worth it, once locked it can hold up to 600nm of torque. i cant believe the grip that the car now has i can stamp on the pedal out of the corners and use all of the power it has transformed the car !
http://www.baramotorsports.com/