WICK3DxGATA Posted May 21, 2012 Report Share Posted May 21, 2012 throttle body spacers in my experience are useless not saying for someone else they didnt do anything. but the best way ive found for some extra power out of a 350 is exhaust, headers, and cold air intake. and just like CleanSierra said about the vette servo it actually does alot to help to. I just had a vette servo and shift kit installed on my 5.3 and its amazing the difference than before. Quote 99 Gmc sierra extended cab front speakers: DB drive 6.5 back speakers: DB drive 6.5 amp: none right not subs: none right now Future waiting to get my 2 skar vvw 8s installed Link to comment Share on other sites More sharing options...
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