this has been asked many times... starting with an intake is a good idea, then maybe a nice cat-back exhaust. id recommend a nice suspension set up if you want improved handling. if your looking for more power, after i/e, you can do headers, udp's, and a tune... or take care of the entire top end at once, and THEN a tune.
^^I don't think you can chip a Focus, but you can get a flash tuner to tune your ECU to optimize your mods, such as the X Cal III. Check out the TUNING FORUM for any other tuning related questions. I hope this helps.
Super chip makes tuners not just chips. I understand there are tuners that optimize your car with mods. I have a tuner for my Camaro. It can give it a tune for more power on a bone stock set up. No mods at all....just the tuner. Just wondering if the fofo tuners do the same thing.
to the OP^ tuners influence mostly all around drivability, but can prolly free a couple extra HP on a stock car. With some mods, it can squeeze extra HP out that would not have been there with mods alone.
I have two tunes in my X3 Ford Power Tuner, one at 87 (economy tune) and one for 93(performance tuen). I loaded the 87 tune when gas got to $5 a gallon and my car just didn't "run" as well and I didn't get any better milage. I reloaded the 93 oct tune and the car came back to life...so I paid the difference in gas just so my ST would run like an ST should run. Now that gas has dropped to reasonable prices again it's not nearly as bad on the wallet, but even if gas goes back up I am not going to change tunes...it just isn't worth it, IMHO