When it comes to oils and air filters, I think the first thing people should stop looking at is HP. They have to perform their jobs, HP gain is a bonus. Oil MUST lubricate the engine properly and protect it from wear and tear. If your looking for HP, there are other things which you can do to get bigger gains. I'd rather lose 3kw at the wheel, than have a busted motor.
Oils will vary from motor to motor. No one oil is suited to all cars.