I saved the $$$ on the intake and just did a K&N flat pack filter. made a difference for sure. I also did Magna Flows without a cat back as the pipe on the sport is already larger. I cannot speak to the down pipe as I did not change that .
The overall Tune is next.. It will be done this week.. Oh yea I have a 15 sport Ecobeast with 5500 miles on it and is about 6 weeks old. Not sure what tune.. Livernois, diablo - trinity, or GAIC ( Not sure yet if they offer one for it ) Have to start the tune homework.