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BackinBlackSS/RS · 11-22-2009, 10:38 PM

No they are not. L99-auto has sound deadening crap in the muffler, where as the LS3 is a straight through design.

11-22-2009, 10:38 PM	#2
BackinBlackSS/RS Go Blue!!!!! Drives: 2012 Cruze LT Join Date: Mar 2009 Location: Indiana Posts: 23,290	No they are not. L99-auto has sound deadening crap in the muffler, where as the LS3 is a straight through design.