Haven't bought a WRX yet, just looking around for what I could do to my future WRX. Looking to get a peanut WRX (02 - 04).

The reason why I don't want to a high flow exhaust is the noise it'll make (or am I being completely naive here about high flow exhausts?). I am aware I can buy silencers for exhausts but that'll just mean more $$$. I'm trying to find out if it's worth performing an ECU tune on a stock car at the moment.

A side note, I'm a tool noob when it comes to car mods.