Hay 1200rc, dont take offence to what has been said in the above posts Nobody is saying that you have waisted your money.

I am sure that your diff set up has made some difference to your car, as it should. I was not sure exactly how these things worked until I had a close look into it, and I was dissappointed to see how small the surface area was that did the "slipping". I think the forum got off track a bit once Phantom Grip type mechanisms got compared to multi plate type LSD, which is not a fair comparison.
Thing is, plate type LSD are hard to find and any alternative is worth checking out even if it means replacing the Phantom grip type unit once a season.I am still going to build one once I have done some calcs and worked out exactly which springs I should use, that way I limit the amount of trial and error involved. It will be an interesting exercise to see what effect the unit has in the dirt. I hope mine turns out as well as yours has and reduces the amount of understeer in & oversteer out.

If I have the time I am also going to investigate the possibilities of useing a modified Subaru LSD centre and a better longterm option. I remember someone posting something about this in past forums, any news re this modification.

Paul.