I will say this......the only "problem" I had with these type headers was where the torsion bars run through the tubes. On one or two cars, I had them rattle against the torsion bars. All I had to do was get the car in the air and use two long pry bars to pry the two tubes apart just enough so they didn't hit the torsion bars anymore. Nothin to it. I didn't even have to pry hard enough to dent the tubes. Just pried them apart from each other a little.
