Hi, I am a new Subaru owner of a 07 impreza 2.5i. I'm interested in doing some work to it to give it some more power and better handling and shifting. If like to know what are some good stuff to buy that are not too too expensive but still good quality. Also I would like to know how much performance tuning can I do to the engine power with out having to do internal motor work. Please give me any advice and pointers thank you.