I run a Detroit Locker. Been in my car about 10 years now and still working fine. I thought bout a spool but my car is mostly a street car and I don't like the spool taking tight turns. If I only drove on the street rarely I would have gone with a spool but I have better street manners IMO with the Locker and it works good at the track. And you don't want to have to push a car with a spool and have to turn it as that's a workout. Ron