Vibrant Performance Collector Tab Kits include two tabs to weld on to each side one for the collector, and one for the runner getting inserted into the collector. Collector Tabs are necessary when building a custom header using Vibrant Performance Stainless Steel Merge Collectors to secure and align the exhaust system in place with the included spring. The spring system holds the slip fit connections in place, however are easy to remove when servicing the vehicle. Each kit consists of one spring and two tabs.