I have a 1999 cobra irs with a torsen diff and 3.73 gears. Has polyurethane diff and subframe bushings. When the 3.73s were installed they were not adjusted properly and it whines when driving**It will also come with a polished slp lm2 catback h&r sport springs and bilstien shocks. Wanting to trade it for solid axle with some mods and complete catback