!EGR and !AIR cleans up the engine bay a LOT and makes for much quicker plug changes (that reason alone is worth it ten fold IMO). TB bypass ain't bad, I had the IAT tricker on my car when I first got it, ripped it off and went back to stock, wasn't worth it, noticed zero difference. If you are clever you can P&P your own throttle body... I never real had the gumption to do that however.
-J
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2012 Caprice
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