Basically you have two types. Tri-Y and Tune Length Headers. Tri-Y are normally a tighter, neater fit with 3x "Y" joins in the pipes. 2 at the top and 1 at the bottom for making a single pipe.
Tune length headers are 4 into 1 at a large collector, typically with a 3 bolt flange. They are called tuned length as each pipe is (supposedly) the same length and come together at the collector. These can be messier fit because of the extra length in pipe circling back.
Pacemaker and Genie are respected brands and you would be likely happy with either. Pacemakers for me can hang a little low to the ground. But I like my cars down in the weeds.
Other brands include HM Headers, Hurricane, Outlaw, Perry, and quite a few re-badged from Liverpool Exhaust.
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