I was torn between the R200CLSD and the R180 LSD conversion from a WRX STi. For my set-up ... a 240Z with a 2.8L (E31 & flat tops) and triple webers ... the R180 route was the way to go. It was easier and lighter. I used John Coffey's stub axles and it was a simple bolt in. If I look at the cost of the cost of the R180, the stub axles, and the cost of rebuilding the 1/2 axles professionally ... it was about $1,000. So the R200 at $1000 on eBay seems like a decent deal. The R180 I have was 3.7 as well. If I were building a higher output turbo motor set-up ... I'd consider the R200 and also go with a CV conversion.