Leeheels territory

Thanks mate

Hi guys new to the site would like to ask people for there options on getting more power out of my ford territory Ghia 2005 AWD non turbo, it has a k&n in standard box but will be getting a hi flow cat and 2.5 inch exhaust done very soon, what else could I do to make quick power with out busting the bank? Also would a under gear change help much