1978-1987 Grand Prix Hooker Competition SB Exhaust Manifolds, 2.5 in. collector, Titanium Ceramic 8525-4HKR

Hooker's new cast iron small-block Chevy exhaust manifolds offer an increase in performance and visual appearance over stock-style manifolds. Their compact design fit into a wide variety of replacement and engine swap applications. This means you get the traditional look and easy fitment of a stock style exhaust manifold but now with a smoother, cleaner appearance, plus more modern features. These manifolds are cast out of high silicon-molybdenum ductile iron for high temperature strength and better resistance to oxidation and cracking. Internally these manifolds have a larger than stock 1 5/8-inch cross-sectional area and 2 1/2-inch outlets for better air flow and improved performance. Offered for both rectangular or raised D-port heads, these manifolds fit many popular GM applications including standard straight, Vortec straight and angled plug head designs. Finishes include natural, silver, black, and titanium ceramic. Gaskets and hardware are included, along with weld-on flanges to aid in downpipe installation
Features:

• A smoother, cleaner appearance compared to stock exhaust manifolds, while maintaining a OEM style look and feel
• Made from high silicon-molybdenum ductile iron for high temperature strength plus resistance to oxidation and cracking
• Designed with a larger 1 5/8 inch cross-sectional area and 2.5 inch outlets for better air flow and increased performance
• Accommodates standard straight, Vortec straight and angled plug head designs for better application coverage
• Includes weld-on flanges for easier downpipe pipe installation (custom downpipe required)
• Available in natural cast iron or ceramic coated finishes (silver, black and titanium)
• Includes mounting hardware and gaskets for inlet and outlet flanges

Specifications:

• Collector Diameter: 2.50 inch
• Header Finish: Titanium Ceramic
• Exhaust Port Shape: Rectangle
• Primary Tube Dia.: 1-5/8 inch
• Tube Material: Cast Ironl

Manufacturer Part Number : 8525-4HKR

Part Notes:

These manifolds do not fit 1st generation F-Body cars. These manifolds do not fit 1st generation F-Body cars. These cast exhaust manifolds have been designed to fit into a wide variety of replacement and engine-swap applications, with final outlet connections to be fabricated by the installer. The manifolds will not directly bolt onto factory downpipes.