Newbie Question

[MetalMulisha]

So im a newbie to DSM's. I just bought a 1995 Eagle Talon Tsi AWD, It has a few upgrades, Greddy cat back exhaust, Greddy 18G turbo, TorboXs boost controller, Dejon intake, Unknown brand tubular headder, Unknown fuel pressure reg, Strut tower brace, B&M short throw shifter, Optima red top Battery, High flow fuel pump(i forgot the name, I think it was red line or something like that) I think thats about it as far as upgrades go. What should i do next? Some people say i need to "Tune" my car? I have no clue what this means I need to do. Any help is greatly appreciated!

 

[Hoot]

...Greddy cat back exhaust, Greddy 18G turbo, TorboXs boost controller, Dejon intake, Unknown brand tubular headder, Unknown fuel pressure reg, Strut tower brace, B&M short throw shifter, Optima red top Battery, High flow fuel pump(i forgot the name, I think it was red line or something like that) I think thats about it as far as upgrades go...

What about the O2 housing and down pipe - were they upgraded too? High flow cat? Or is that 86ed with the Greddy cat back?