Thread: 1LE build and Journal - SUKXOST [COTW 12/31/12]
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Old 11-28-2012, 08:08 AM   #128
BlkSlvrdo129
 
Drives: 2008 Silverado
Join Date: Dec 2010
Location: Canada
Posts: 98
Are the NPP mufflers normally closed on the inside pipe? And the engine vacuum opens them? Or is it the opposite?
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