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Based on the dyno sheet the A/F seems lean?
What intake are your running?
What is the exhaust set-up after the headers?
Running the LS6 intake with stock ported TB. I'm sure that is holding the set up back a pretty good deal. It's just kind of hard to justify spending $1,500 for a ported FAST 102 set up for 30ish HP and even less TQ. Maybe money would be well spent on a 150 plate kit.
Do the fast 102 set up....dont get a fast 102 tb tho that has been a huge pain in my tuners *** go with the nw tb and dont look back my car made 482rwhp and 424tq thru a 4000 stall on a mustang dyno stock ls1 motor and 1 3/4 headers with the ported fast 102 setup
I agree a better intake and you should see those numbers go up. Maybe look for a used 90/90 setup. You may luck up and see someone selling one at a good price. probably 7-10hp less than the 102intake will get you...but much better than the LS6 Intake.
From: Coast of San Mateo County Between Pacifica & HMB
^^^^^^^^AGREED^^^^^^^^
MAMOFIED Ported FAST 102 + NW 102 TB worth AT LEAST 30/30! on your combo maybe 35+ @ Peak vs current combo and huge area under the curve starting at 2500 RPM with 20+ lb ft.
For the LS6 top end your right where expected. You could find a decent used Fast 90/90 combo for cheap if you look hard enough. That setup would net you 25-30rwhp. OR, like also mentioned, spend the doe on a ported 102/tb combo and POETENTIALLY see 35+. Not guaranteed, but if its in the cards, mamo would be the man do it for max effort.
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408 Build dyno numbers are in 
