N/A Exhaust & Air combo?

[Matts]

Ok guys so im just wandering what sort of exhaust / induction kit combo should i go for on my n/a? im looking for a more of a performance increase than a powerful sounding setup although i do want a deep sounding system? ive noticed alot of people on their build threads have custom 2" - 2.5" stainless steel catback and a lets say a 3.5" backbox? but ive not really a huge clue in this area? and im not sure about either a panel filter or a cone with cold air feel? any thoughts are appreciated.