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Well companies like Hogan's racing manifolds make sheet metal intake manifolds for our cars, they are not cheap by any means. You could go with the Holley square bore style manifolds, but use a 4 barrel EFI throttle body or a Weber IDA style manifold with some TWM individual throttle bodies. All these options would require you to have some sort of fuel & ignition management. Racing Beat offers a decently priced header that is a great upgrade, but if you can get your hands on a out of production SDJ header or a custom header from Defined Autoworks. Both of the last header options are pricey. Vibrations, maybe something loose?????
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