Quote Originally Posted by NoRotor
It wasn't H.
It was just I/E + tune. Stock LS3 heads are aleady pretty damn beastly.
H=Header, not Head

Quote Originally Posted by 1.8t
Intake, headers, and an exhaust gave me 31whp and 40wtq(which is average from what I have seen). From that 31whp and 40wtq, I picked up 5mph in the 1/4 mile in a 660' worse DA day than my stock times. I would expect my car to put down some 11.80's @ 122ish on a slightly negative DA day.
Gotcha. The 5mph is a nice gain, but i just thought you would see more power out of that. I'm no LSx follower though so I dont know the facts. Thats a nice TQ gain too. Either way, you are still faster than me