Headers get installed after I finish with the suspension work. I've been back and forth on Long vs. Short for some time. Dollar per horsepower gained, the Shorties are equal or better than the Long-tube set up. The Shorties are in once and done; end of story and smog legal. The Long-tubes are mostly smog-illegal as they come, require replacement of the H-tubes and Cats, and/or require sensor harness extensions, etc. Also you have to be aware of engineering new heat-shielded areas when you relocate the Cats. Those babies get HOT! So all said and done, the Longs win, but at a much higher price.