More peak power on a different dyno, right? Without a doubt any car that has longtubes makes more power through the curve. They change they way your engine runs by making it more efficient, so dont for a second think they are not worth it because your car with headers would run faster down the track than without them. They also support all of the other modifications you do to your engine (intake, heads, cams ex cetera).
I have a full stainless works exhaust and just like all my other cars I put headers on, my 2011 liked them just as much! :burnout:
yes, 6 pulls all done back to back, no cool down!