If u have a fast 92 and a 90 mm tb on a ls6,u deff need to get a tune!! Ur running very lean!

 

I have a tune also

 

All this info would have helped from the beginning. But I still say have the tune looked at

 

Dyno tune? Canned tune? Any mods after the tune? Who did the tune?

Feel like we're interpreting the dead sea scrolls here, lol

 

lol at this whole thread

 

PCM for less

 

You need a dyno tune

 

The only thing that will make your car feel slower at lower rpm's to be noticeable is a cam (for me at least). But once it hits 2500 it makes up for it and then some...Also I did notice an improvement with headers as soon as they went in, are yours 1 7/8 or 3/4? You may be losing some of your low rpm power due to having too big of headers with no supporting mods. Need to suck more air in to make them worthwile if they are bigger (cam, heads, blower)