18G on the 304 S/S. Item must be in NEW condition with original box. Any Used/Test Fitted/Mounted item will not be refundable. The item "PLM POWER DRIVEN EXHAUST HEADER FOR HONDA AND ACURA WITH B SERIES ENGINES" is in sale since Sunday, December 21, 2014. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Engines & Components\Other".The seller is "vex-ms" and is located in Santa Clara, California. This item can be shipped worldwide.