2.4 LITER. 2WD. W/XRS. A Spring bolt, which is a specially designed shouldered bolt with matching Spring and nut. It is designed to bottom out against the flange, which preserves the Spring's force (acting as a locking measure) without over-compressing it, which can lead to failures during the high temperature cycles found in Exhaust. These bolts always mount through the flange, with a nut on the backside. A Spring that is placed between the Exhaust bolt and flange and provides tension against the bolt. A Spring which mounts between the Exhaust manifold bolt and its mounting surface. Exhaust Manifold Bolt and Spring. Exhaust Spring. Compression. Bolt. Center. Chrome Extension. Converter. Converter AND Amplifier. Intermed. Muffler. Muffler AND Amplifier. Tail.