QA1 is a bottom of the barrel K member. If you want the best one, get Max Motorsports. If you are going to get a cheap one, at least get the UPR. Its not great but its a little better than the QA1.
2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.