4-1 Merge Collector, 1.75" Inlet I.D.; Merge O.D. - 2.50"; Outlet O.D. - 3.00" 1989-pontiac-firebird-esi6878223 Polyurethane is a synthetic polymer

Polyurethane is a synthetic polymer with many properties that make it far superior to OEM rubber for bushings

* Left-hand threads between the base and the body ensures that the shock/strut doesn’t come apart when adjusting the ride height

reducing nose dive during braking

engineered for excellence

4-1 Merge Collector, 1.75" Inlet I.D.; Merge O.D. - 2.50"; Outlet O.D. - 3.00" 1989-pontiac-firebird-esi6878223 Polyurethane is a synthetic polymerVibrant Performance Merge Collectors feature complete 16 gauge, 304 Stainless Steel construction, precise fabrication and back purged TIG welds at every seam. Each Vibrant Performance collector is ready to weld straight out of the box with little or no prep required. Sold individually.