I just put the calipers on my pipe just before the muffler. 1.94xxx inches. Pretty close to 2" OD. I also emailed Walker about what type of sound to expect from the 18557. Now for a new question. I am looking at Manzo strut braces. Any good? 2004 Grand Am will fit the Alero? This forum will cost me $$$$$$$$$$$
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2004 Olds Alero Sedan 3.4L GLS
3.4L = 207.481 Cubic Inches for us Old Guys
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