I just bought a 2001 dodge manual and am kind of low on cash. I was wondering what are some cheap yet noticeable ways to improve power? Air Filter? Exhuast? Has anyone simply pulled their stock muffler out and put a piece of pipe in their with leaving the catalytic converter? If so, how does it sound? Could i just go to the muffler shop and tell them I want them to straight pipe it from the turbo back or is it better to buy a kit? Thanks