help with engine mods

barlow S5

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Blackburn, Lancashire
got audi s3 210 bph

It has a stainless steele exhaust cat back, front mount intercooler, forge achuator and a custom remap, want a bit more power out of it

If i do the following will i gain noticable power:-

K04 hybrid, tublar manifold, 3 inch downpipe and if i do this will need to change injectors and rods?

I would put bigger turbo on but it won't bolt onto my manifold will it?

probably got about £2000 to spend any suggestions?

cheers