Don't disagree that adding headers with a blower can/will add power. The question was more related to adding headers only.Hey guys. I have seen great gains with headers. I run American racing headers in my 06 z06 with an root type edelbrock E-force supercharger. The headers add noticeable power and a real rumble. It's turns heads at idle. I have the mild to wild control for the exhaust baffles also. Yes they did get the car a bit warm but I wrapped em with header tape and problem solved. I'm running 6 psi boost and Power above 650hp. With the ls7 not being ment for boosted applications it's important have your aluminum block sleeved prior. If not you will crack your block. Callie's rods, diamond pistons and an mast motorsport ls7 heads with 250cc flow are being added currently. The more air you drive through the motor and get out fast the better it breathes. I recommend all of these upgrades, really make an amazing driving experience.