....A friend who has a remapped Ferrari 360 (? it looks exactly like a 430) and tracks it, is so impressed that he wants some AP's!!
Getting more back to your original post, an air intake doesn't deliver much unless you also fit a Turbo-back exhaust plus remap. If you want to keep the stock engine cover box then an ITG Pro is probably the best panel filter.
What do you mean by a "front mount" - A front strut? - The Mk5 GTI chassis is considered especially good and unless you do some serious track work with roll cage mods etc, I'm not sure it's worth it.
Are you thinking of doing quite a few mods and would you be going as far as things like a LSD diff, engine mounts, professionally sorted suspension?