The Scavenger Series incorporates two types of technologies. The Scavenger mufflers are a direct collector replacement that attach to the primary tubes of your header and help quiet the exhaust at high RPM's. The patented Scavenger collectors and cross-over pipes incorporate large D shaped ports to help scavenge the exhaust gases for a cleaner and more efficient burn in the combustion chambers. Please call the Flowmaster tech-line for assistance with specific decibel requirements and applications. Durable fully welded 16 gauge aluminized steel Patented D-Port technology Excellent for 2 into 1 exhaust system configuration Race application for single exhaust systemProduct Description: Scavenger Series Y-Collector, 2.50" x 3.50" : ea, 16 Gauge Aluminized SteelPit Stop USA offers Flowmaster Scavenger Series Y Collector - 2.50" Primary / 3.50" Final Y250350 at low everyday prices. Be sure to check out all our products from Flowmaster including Flowmaster Y-Pipe Merge Collectors.