Joined: Mon Jun 04, 2012 10:09 pm Posts: 813 Location: Sydney
Vehicle: 92 sierra tintop, 88 WT sj50
Posted: Wed Oct 31, 2012 8:35 pm
Hi guys n gals. Just wondering if any of you have punched out your stock cat converter on a sierra? Does it have any affect on performance or fuel consumption? Any help is much appreciated!
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