DIRS for 2015-newer V8 Chargers/Challengers/300 RWD Patented Protection! D ifferential� I ntegration and� R einforcement� S ystem - reinforce your differential case and improve your car's IRS operation and traction with the DIRS! 100% satisfaction guaranteed. New two-piece transformative product from Per4Mance Development: - Part one attaches the differential using the lower two main case bolts and the three lower case bolts to reinforce the differential. - Part two attaches to the rear cross-member and carries an OEM differential bushing (just like the two in the rear cross-member) to add a third, triangulated integration point to "attach" to the reinforced differential. IMPORTANT: Use of an aftermarket brace will impact the manufacturer's warranty on the differential. Purchaser assumes all responsibility for installation and use.