Ah! A noise generator. You may gain up to 10hp, but whats their torque gain? Just as I thought, not shown. If that spyder outfit can show you a BHP chart of that intake versus a stock air box on either a flowbench or engine dyno, then I would get one, otherwise, they just lie about a number that doesn't exist in engine power.
Now, if you added a bigger throttle body, intake manifold, and full exhaust, then I would believe those numbers. Companies will do whatever they can to sell you their product, it may not be a lie, but if they can show you paperwork of their product proving their testing and numbers, then I would be allover it. Chances are, spyder is not accurate.
I would agree with Plain Jane, K&N has the most in R&D in their air filters, since all they do is filters. They offer best warranty hands down as long as you do the correct maintenance to their products (not over oiling their filters, which in liability of the owner damaging sensors and engine components). The air intake system is an upgrade, but your gonna hear it more than feel it. If I had to get that intake above, I would at least swap the cone filter to a k&N filter cone or AEM dryflow. If you want more MPG, go with K&N's drop in replacement, $40 for 1-3 more mpg.
2009 Cobalt LS XFE U74
Mods: K&N Typhoon Intake, Option Cat-Back Exhaust, Cosmo Short shifter, Maxxim Ahead 17X7's, MPx shorty antenna, FE5 Strut/shocks, Tein S Techs, Moog endlinks, Moog spring seaters, ZZP shorty header, LSJ downpipe, LNF front grille