Private Label MFG Power Driven H-Series header features a true 4-1 merge for equal exhaust flow. This one piece design delivers the best HP performance while still utilizing your factory OEM Catalytic converter (CAT). *Private Label MFG recommends using our test pipes for easier installation of H-Series headers. Recommended for swap cars with H22-Motors. This Exhaust manifold was intended for regular H22 swaps and not H2Bs. Modification will be needed to make this fit H2b kits, depending on the make of the kit. a few percentage of h22 motors have a few different deck heights, 1 part of the steel oil pan might need to be massaged to have the header fit. If your oil pan is aluminum, we do recommend swapping it out for a steel one. Features:Brand New In BoxMade of 304 Stainless steelOne year limited warrantyTrue 2.5" collectorMachined CNC-ed manifold flangeFlange is .38" which is just about 3/8" thick18G on the 304 S/S. Measured at .049" to .050"One piece design
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