Will i feel a difference with headers in power
It is a vicious never-ending cycle... But damn it is gratifying!
What kind of headers & Y pipe did you get?
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But after gaining a DYNO-PROVEN 16rwhp (which wasn't as much as I had hoped for BTW) after the installation of LT's + highflow catted-Y on my stock-internal LS1, I couldn't really tell much (if any) difference throughout the powerband. It sure sounded a lot louder/meaner up top though. 
Come to think of it, I've never really felt much of a difference in horsepower/torque gained for mods like intake lids, cat-backs, cutouts, headers, PCM tunes, etc. I've never done any engine work before on any of my 4th gen Z28's, but the only two noticeable mods were a Vig 2800 torque converter on my old LS1 and the recent 3" H-pipe true duals I just recently had installed on my newest LS1. Wow, what a serious gain in low-midrange torque with these duals!

Now I floor it in 1st gear and it sounds like the damn Jeapordy song is playing in the background. "Uhhh, is it time to shift yet Alex? No? How 'bout now?"


Not much difference down low but up in the high rpms its a nice difference