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Fits GM LS1 engines
6mm (4") diameter
you need the Aeroflow Performance firewall feed through
Liquid Actuator Cooling Option
BMW 535 2003-2013
Aeroflow 3 Bolt Stainless Flange 3 AF9551-0012 LX Fits GM LS1 engines3" (76. 2mm) I. D x 3 8" (9. 52mm) Thick, Sold as a Pair Custom build your exhaust with high quality Aeroflow components. Aeroflow CNC 3 bolt exhaust flanges are manufactured are manufactured from 9. 5mm (3 8) thick 304 Stainless Steel. They are precision cut to reduce warping, and prevent leaks to provide a 100% flat surface for a sure seal! Available is sizes from 63. 5mm (2 1 2) to 101. 6mm (4). Sold As A Pair. AF9559 2500 Copper Gasket to suit
