Unfortunately you won't hear much back for two reasons. The car isn't a commonly modified car and requires some knowledge of what works and what doesn't work, instead of just ordering from a catalogue to make a 'custom' car like an EVO/WRX/Skyline. Secondly a workshop will judge you over the phone and assume that someone modifying a Corolla is a kid and a time waster, unfortunate, but true. Usually best to turn up and talk in person; as they say, money talks, bull**** walks. In summary; CAI - Injen or CES Exhaust - 2.5" mandrel bent system from the cat. Engine internals - Look at the monkeywrenchracing website. But probably not what your after at the moment. Suspension - Order from someone like Greenline or Nengun and follow a guide in the guide section, or take them to a workshop to be fitted. There is a sticky in the suspension section listing part numbers. Brakes - Just change the front pads to something that suits what you want to do with the car. 0-500*C for mountains, 0-800*C for track work. No need for the extended push rod, engine mounts, heavy duty clutch (only really need for forced induction).