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These mandrel-bent 409 stainless, ceramic-coated headers (1¾-inch primaries, 3-inch collectors) are manufactured at SLP's facility in New Jersey. They were developed for the 6.1 SRT8 LX cars after we tested the 5.7 headers and exhaust. The 3-inch high-flow bullet catalytic converters go into 3-inch down pipes. They'll bolt up to the factory exhaust or any of SLP's three available exhaust systems (Loudmouth, Loudmouth II, or PowerFlo).