i have the rk sport header it`s a direct bolt up
the only modification you have to do is to the rear of the craddle
i took my tourch and heated up the back of it and slowly beat the rear of it down
the craddle on the j-body and the n-body are different
i love that header allot of power and tourqe out of it
and stick with the factory cat no need for a high flow at all
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