i got a miltek anni rear and CAT back, APR 200cl CAT and 3inch DP, all in for about £480 so it really depends where you go i suppose, wouldnt mind the custom option but tbh the sound of the miltek is what i love and a fair few people around these ends are now looking to turn after their exhaust systems are run next to mine
maybe when i get the mk6 i'll go custom but i dont mind a bit of scene tax on the mk4 lol may even go air ride next year lol