I use the Retrofit LSD, which is a custom made deal..They machine the diff spider gear faces flat, and use high quality friction plates to lock them together, and only slip during turns. The turns feel no different than stock from what i can tell..maybe a bit tighter..I really am looking for 15" slicks, but i have the GSX front brake calipers, and not sure if that size rim will fit over them..i'm going to need some stronger axles as well, if i want to really launch the crap out of it..which i need to do to utilize the slicks and pull a 1.7 or 1.8 60 ft..