The S13 / S14 240SX Level 5 axles feature a Porsche style 108mm inner and outer CV, our high-grade aircraft quality torsional center bars that twist significantly more than a factory unit, allowing them to absorb a great deal of the shock produced by high horsepower applications. this axle also features our new bolt-on outer stub that fits the factory wheel hubs and precision billet adapter plates with hardware to mount to the factory differential stubs.