I have an 01 wrangler with 2.5,5-speed, and 31x1050x15 tires. I see these ads where cold air intakes increase horsepower, and torque by 10 HP, and Torque by 10 ft lbs. I have been told by one company (afe) that they garantee this or your money back. I have been told on other jeep forums that these are a waste of money on a 2.5 engine. What do your members think? Thanks