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Hey im new to this site and thought id join since i have a skyline series 1 gtst rb25. I was hoping to achieve roughly 220 to 250 kw and was wandering if thats possible with say around 6 k to play with. Already has a manuel turbo boost controller 3 inch all way through hks exhaust . Motors been looked after has around 110km on clock . All advice would be appreciated and one last thing can you get that power on stock cam  and injectors ect or all has to change.

Well, the auto is ghey, so you'll have to leave the women behind. But......

You need a turbo.  Excluding 2nd hand deals, the cheapest way to do that properly (Hypergear) is going to cost you ~$1k.

You need injectors.  As above, ~$600.

You need a fuel pump.  $200 or thereabouts.  Could be more, could be less.

You need an intercooler.

You need an ECU.  Depending on what ECU, you will need an AFM.  This line here can cost you between $1k and $5k.  Tuning will cost at least several hundred.

You do not need cams.

You will probably need coilpacks.

110k kms, is funny.  More like 210k kms.

If you need help fitting it, then there's $$ hiding there,

In short.  It is possible to do all this inside your budget.  Kinda, just.  Could be done for less with good scrounging and not much paid labour.  Could cost a reasonable amount more if you need to pay someone for most of the work.

I strongly suggest you have a look at the RB25 dyno thread.  All the information you really need has been posted on this site about 3000 times over the last 20 years.

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