Just remapped my a3 2.0bkd tonight. Very happy with the increase in power. I used mpps cable and a file that I arranged with Andrew at black smoke. Just £45 for the file which included an egr delete and hot start fix. Can anyone recommend any cheap and simple mods to go with it, I'm a mechanic so have access to tools equipment ECT, was thinking of cutting my cat open then rewelding and maybe a panel filter. Are these a good choice and what else could do on a budget with my access to tools and equipment?