The rear pipe slips onto the front pipe and gets clamped with the clamps that are supplied in the Corvette Central exhaust system. The rear pipes fit correctly with no modifications. The only modifications were at the front for the headers. Since we have the Keisler Tremec five-speed in place, we fabricated a custom bracket to retain the exhaust at the transmission. Corvette Central supplies a new transmission exhaust mounting bracket when the system is changed from single to duals when you have an OE manual or automatic transmission.