Headers that dont bottom out
Everyone seems to want headers that don't scrape but yet nobody has ever listed any measurements about ride height they want to run. That is really the only way to figure out what header options you have.
Cheap headers work fine for me with a stock ride height and maybe slightly taller than stock tires. I don't have to be careful going over speed bumps or driving on craptastic new york roads.
Obviously some people wish to run a bit lower, if your slamming it on the ground tti's or dougs are probably what you need. If your in the middle somewhere maybe those block huggers would work good.