cleansss20 Posted October 14, 2016 Report Share Posted October 14, 2016 I have an 03 with a return style rail. I'm swapping out to a nnbs intake and rail which is returnless. After I ordered the corvette filter I got to wondering if I should stay return style or swap to returnless. Will I need a retune since the old rail is vacuum referenced? What will change when I put my procharger back on...can it still accurately reference the boost thru the tune without going full SD tune? I want to make it easy for me but also easier on my tuner too! Quote Link to comment Share on other sites More sharing options...
SilveradoJakee Posted February 9, 2017 Report Share Posted February 9, 2017 Plenty of threads on here and PT.net Lots of great vetrens have done this mod, and lot of them did a write up and put there 2 cents into it. They maybe dated while back but so much good info for these trucks Quote Link to comment Share on other sites More sharing options...
Mrrat1SS Posted February 18, 2017 Report Share Posted February 18, 2017 Whats the nnbs intake? Quote Link to comment Share on other sites More sharing options...
matslp488 Posted February 18, 2017 Report Share Posted February 18, 2017 Whats the nnbs intake?07-2012 I think intake or tbss same thing Quote Link to comment Share on other sites More sharing options...
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