I need some input with mod this car<br>Is changing chip worth it? and does the warranty void?<br>I want to buy jba header, has anyone had this installed in his/her car? <br>I want to put a nice wing in this car, does anyone know the good one and good price too?

I am pretty sure that changing chips eliminates the computers ability to adjust timing etc. I am fairly certain it will void your warranty. I do have the JBA header installed. It did make a power difference but not what I had hoped for. I'm thinking the problem is with the factory cat being restrictive. I really dont know if anyone makes a high flow cat. You can pick up the same rear wing as the Focus WRC for about $600 at www.batinc.net. Hope that helps.