I'm not knocking custom exhausts by the way, and you are right it is similar to clothes, my analogy is that if you buy a custom exhaust for a Zed for £600 and say 12 months down the line you need to sell and you get £100 then its cost you £500. But let's say you buy a branded one at £850 and sell it at £650 12 months down the line then ownerships cost you half of the custom system.