Quote:
Originally Posted by millatime84
I just recently installed a NPP Catback on my 2010 SS and retrofitted my own NPP in a box. (can create a DIY later if needed) I was disappointed in the difference between open and closed. The sound difference at idle is minimal. At WOT you can noticeably tell the difference. Has anyone else experienced the same outcome either with a factory NPP or a Retrofit? Also has anyone opened a Camaro NPP muffler to see if the straight through pipe has holes in it similar to the early Z06 mufflers? If so I was thinking about having a muffler shop cap the the straight through pipe.
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You got it to stay closed on idle (Camaro defaults to open on idle)? I always guessed that was possible with some wiring... and it's what I always wanted to be able to do when I had my LS3 with NPP.