I have the Dynomax Ceramic Coated Headers on my 73 Challenger 340 Ralleye, They look great sound good, Minimum hassle to install. They will not work with quick ratio steering. Most cars that had the Quick Ratio steering were the T/A's which had the X exhaust. After months of not being able to drive my car because my pitman arm hit the headers I found a pic which shows the Quick Ratio arm versus the straight standard arm. Most cars will not have this. The difference from what I could find is the pitman arm is curved on Quick Ratio steering and straight on standard steering. The stops in the gear box were also recalibrated. I'm going back to the staright pitman arm and a tire/wheel alignment. I stand to be corrected, it's all I could find on it. $278.00 Summit Racing. TTI and others have the standard disclaimer will not fit Quick Ratio steering.