Not a problem. One thing you'll find is we love telling you all this.
UK's are more prone to tin worm due to a full life on salty roads. Imports aren't immune and it depends on its time spent over here.
For me I did the "simple" mods. Went for an rcm fuel pump to insure constant reliable pressure. 3" turbo back zorst with decat downpipe. Cosworth panel filter and 3 port boost solenoid(imports have these anyway) UK's use the smaller TD04 turbo so with all that I then went to have it mapped and made 276hp/280ft-lb. I've just started to work on suspension so did rear 22mm whiteline arb, ally drop links all round, poly bush on rear arb and I have some hks coilovers waiting to go on with front and rear upper strut braces. That's all for now I think [emoji23] [emoji6]
Imports have the larger TD05 turbo and make 270ish hp standard. If you were to do the same mods and then map it the TD05 should give you 320hp. After that it's new turbo, consider fmic, injectors. General consensus is the 5 speed gearbox is only capable of 350hp before breaking.
I lose my chain of thought sometimes. Probably missed a few bits 😁😨