By doing those mods you should have some gains automatically if the system is flowing better than stock. Its hard to say what kind of gains can be had until you try and tune with your setup. Regardless of what you do tune wise don't expect major gains like with the turbo cars just from a tune. Again your doing the right thing by improving flow and gains will just come naturally to a point even without a tune on these 2.5i applications.
I would venture to guess you could net 10-15whp with some tweaking.
Originally Posted by aleutdude
Sorry for the threadjack, but what kinds of gains could be had if someone had a CAI and free-er flowing exhaust already installed?