Please do us a favor.. put your year and model of car into your profile under signature. It helps greatly.
We don't really have performance "chips", the pcm or computer can be reprogrammed. Check out www.intense-racing.com
they are very good and very reasonable. Some others are HPTuners and DHP, although both of them require you to know something about tuning the car.
FWI.. yes..you can make a custom splash shield.. I haven't yet and so far I'm fine ... filter needs to be cleaned though