I have the chrome BBK shorties on my car for over three years(unequal length), and the quality is awesome. Some of the nicest headers I have ever seen. They NEVER turned blue, and they still look great. I would recommend them 100% based on my experience with BBK headers.
I originally was going to order MAC, but the guy at the speed shop told me macs quality was "inconsistent" and wouldnt even sell them to me. Then I went with the BBKs.
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1993 GT/AOD
'93 Mustang GT