Quick view Wavetrac Wavetrac Differential - BMW E30/E36 325i, M3 (188) Fits BMW 188 Axle: E30/E36 325i & M3 USA. E28/E34 533i & 535i. E24 633i-635csi. E36/E37 Z3 6cyl M Coupe/Roadster. BMW 735i.Wavetrac diffs are state-of-the-art helical gear differentials... $1,841.12 Add to Cart 1 2