Upgrades to facelift RS3

I'm thinking of getting a few things have done to the RS3 which include a new forge intercooler, hard intake pipe and turbo elbow. Before I get the map done I can't decide whether to leave the exhaust system as it is as im happy with noise levels or get the miltek hi flow sports cat and big bore downpipe. I'm against getting a decat for now even though it's a much cheaper option. Just wanted to know if anyone had any advice as without exhaust work saves me about £1400 which is a fair chunk of spending money. Any advice would be greatly received, ta

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