Just threw on a Cartek ported LS6 intake. Wow, it made a huge difference over the stock LS1 intake. The butt dyno thinks 25ish, but the real dyno will tell me today. I used to be able to get traction up top in 2nd gear. Not anymore, I roast them thru 1st, 2nd and most of the way thru 3rd w/o even trying.