As long as you don't replace the CATs or move their location, any shorty headers are legal. Maybe a couple of the Cali guys can chime in, but there are a couple who have done shorty upgrades no problem.
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Formerly owner of:
2012 2SS/RS Build Thread - Totaled by red light runner
2010 LT/RS Build Thread - Traded in for 2012 2SS
2007 Acura TSX
1992 Oldsmobile Achieva V6
1992 Mercury Sable
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