I searched a lot on synchromesh and redline. I heard a lot of not so good things on redline. I also read that the pennzoil synchromesh is the exact same thing as the gm synchromesh. same people make it or something like that. a couple people said they tried redline and ended up going back to pennzoil. this was people with s2000s and dsm's and civic. every tranny is gonna act different though so its hard to go off what people say. I also heard from a lot of people that neil isn't that expensive also and you have a tranny you can count on for a while