There is a big market for exhaust for the EP3. I would personally stick with the Jap stuff. Again you will pay more for it but the quality will be better. Avoid cheap exhausts from ebay.
Audi - no options.
I would suggest going for a Spoon N1 exhaust. Has got a nice quailty to the sound, and sounds brillaint when VTEC kicks in y0!
Also you can have lots of fun with this exhaust, by setting lots of car alarms off
As for induction kit, I would go for a AEM Kit. This adds slightly different tone to the engine, and AEM is a well known World Wide brand.
Music wise, there is a Alpine Sub called a 'Type R' which is 12". Two of these would look good! Thats the plan for my Type R when i get it any way =]
Type R Sub's sounds really good, i had one in my current car (Punto ), linked up to a Alpine AMP, the linked to a Kenwood W707 headunit. All together this sounds brilliant!
Mods inside the car are very worthwhile as thats where you spend your time! As for other mods deal with handling first and then address power it will make you much faster
what about buddy club exhaust whats people opinion on them ??
Don't get buddy club. Heard they don't age too well. Stick with spoon as long as you don't have to drive too far.