It all depends, for my truck, stock is 381hp, supercharged is 505hp with the TRD setup which if installed by a dealer is covered by your warranty, a cai might tell you 15-20hp and they may make that at the flywheel but you'll never get that much to the ground, only way I can tell my intake/exhaust gave me more power is when another tundra that is stock tries to race and I win! Lol as far as SC cost, you're looking at anywhere between 5-8k installed.