Looks like a wise decision to get away from that header. The flange looked thin and poorly made. You can't go wrong with the stock manifold and it keeps engine bay noise in check vs. a header.

I agree on the header too. Looks homemade and the pipes dont seem to match the ports all that well.

Im using stock EFI so Ill be staying with the stock manifold too.

I wonder if there is any benifit on a stock to mild engine (except cosmetic) using a header since the stock manifold flows well with some port matching? For a performance engine its different, but then you would choose extractors with matched tube length.