The problem originates in the technical understanding of what constitutes a true D-PORT versus a D-shape. The D-Port roof extends well above the centerline of the exhaust port, whereas the D-shaped port fits nicely inside what is deemed a standard port dimension. As shown in the graphic below, the d-shape easily fits within the common round or square port flange opening. Many specialty header designs such as Lake Headers, Lake Pipes, and Zoomies are designed to be era correct for certain car builds.

Total production for Firebird models increased to 128,304 units, making this the best-selling year of the third-generation Firebird. Discover all our supported vehicles with year, make, model, engine, and credit - licensing cost information. For all your automotive needs, look to our in-store automotive experts to help you find parts for your car, truck, boat, or RV. We are your one-stop-shop for sourcing the automotive aftermarket parts you need to maintain, repair, or upgrade your vehicle. Based on OEM style fuel tank and&nbsp