sparkplugs.com Enter the code at checkout: dodgetalk It gives you a 10% discount. End result is a Denso O2 sensor (what I'll be running) for under $50 shipped.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne