http://www.corvetteonline.com/news/video-fast-lsxr-intake-manifold-shows-big-rwhp-gains-on-ls2-c6/
I was surprised by this bolt on car, gains. It was over a stock LS2 intake, and ported stock TB. I’ve seen gains as little as 4whp over a LS3 intake ported at the shop, to a 102mm FAST (PN-146102, LS3/L76/L92/L99). On a G8GT with bolt-ons, NEP cam and ported heads, making almost 500whp.