Direct bolt-on fit without modifications.
3/8'' laser-cut flanges for leak-free performance. Header ports sized
to offer optimized flow for the widest range of heads possible,
including popular Crate Engine cylinder heads(ZZ4, ''Fast Burn,'' LT1,
etc.). Low-profile collector ball & socket connections for max
ground clearance. Stepped tubes for big power. Long tube design for
extra power. Header Systems include headers, gaskets, bolts, and
hardware only. 25-91-095250S Reducer required for street hook-up.