Interested in the 07 Yaris Hatchback

[githzerai]

We are thinking of selling one of our trucks to buy a Yaris Liftback. But, we both worry about the horse power, 106 is pretty sad in our book. The last 100 hp car I had in the 90's barely got up over mountain passes at 35mph. Our RAV4 has 161 and the Titan has over 300. Gas is killing us, $500 a month in gas truely blows. The Titan is for business, so the RAV4 is going byebye. Here is my question, what kind of performance add-ons are available for the Yaris to boost the hp a bit? I have read about the cold air intakes and the Megan Header... but is that it? It would be nice to get it up in the 120-130 range but still be street-legal, while not destroying that fine gas mileage.

Thanks.