Wessa Your coil is mounted upside down for some reason, just turn it around.
Its difficult to know what will be best for you to give your car some more poke without it costing a fair bit.Minimum would be as someone else said, maybe T34 turbo, green injectors, uprated chip, 3bar map sensor and an RS500 style intercooler. This would give a very noticeable improvement in performance but IMO you would also need at least a group A headgasket , an uprated oil pump and maybe uprated cams.The trouble is where do you stop?
As I said once you start it will get you hooked and you will want more and more and you will need deep pockets!
I hate to think what I have spent on mine over the years but I love it. To have an old 1990 car which can out perform most things which cost a hell of a lot more is great fun!!!