Adapter, MBRP Exhaust Adapter, Universal Adapter, T409 Stainless Steel., 4in. OD. to 5in.ID, 7in Length, Adapter, T409, 4in. OD. to 5in.ID, 7in Length, Adapter, T409 Stainless Steel., MBRP Exhaust Adapter,5in Outlet Diameter to 4in. Inlet Diameter., Universal., Exhaust Pipe Adapter.