I don't like the look of the reducer on the Heddman header. It looks way to short. It's probably not that critical, but a good collector should be a bit longer with a more gradual taper. TRD makes a nice header, I see 'em on Ebay every now and then. LC Engineering makes a nice one too, nice long pipes, equal length primaries, kinda pricey though. I'd imagine any header would give you a decent "seat of your pants" power upgrade, even if it isn't perfectly engineered.
