There is a reason so many things are popular for an LS1 f-body. LS6 intakes, cnc'd LS6 or 5.3 heads, cams in the 224-236 duration 550-600 lift range, because these are the things that work well for these engines on a budget. Want to spend more money and pick up a few extra ponies buy a Fast intake, and some TrickFlow or AFR heads, but don't think that the shit Edelbrock, Weiand, or Holley makes for these engines to be worth a shit.