Here's the alarming trend that most wouldn't notice.... Everyone here who has them has an S14 (maybe not GreenLightGo). This makes a big difference. When you do solids on an S13, the diff makes a ton of noise because it's directly bolted to the subframe. On the S14, the diff is isolated from the subframe with 4 bushings. It's the 4 bushings that keep the diff noise out of the subframe and car.