GM LS1 LS2 LS3 LS6 Cast Iron Rear Exit Exhaust Manfiolds Cadillac Dyno operators found that additional

Dyno operators found that additional progression holes smooth out the flat spots in the progression phase between idle and the main circuit

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Fits Ford Small Block Windsor:

GM LS1 LS2 LS3 LS6 Cast Iron Rear Exit Exhaust Manfiolds Cadillac Dyno operators found that additionalBrand New Cal Custom GM LS1 LS2 LS3 LS6 Rear Exit Cast Iron Exhaust Manifolds Fits GM LS1 LS2 LS3 LS6 Cast iron Rear exit design helps with clearance issues typically found with headers or centre dump headers manifolds The header set includes 2 manifolds, 2 exhaust manifold flanges, 1 bolt & stud kit Note: Minor modifications may be required for fitment on certain models Professional installation recommended! No instructions included! If your vehicle