Don't listen to them arggggh!!
Got 90,xxx+ km's on it? Rebuild it. Simple.
If i see another person spend 10 grand+ on bolt ons im gonna scream. It's just dumb...ull high flow ur turbo, run higher boost, throw an fmic on it, with a decent new exhaust, new ECU and then after u run 20psi thru stock internals u'll wonder why 10,xxx km's later why your bottom end is f**ked.
Be smart. Make yourself a decent building block. Forge ur bottom end, make it strong.
$4k on forged rebuild with new metal head gasket, replace everyting. New bearings, machine ur cranks etc etc.
$900 on PFC (if u can find one)
$700 on a decent FMIC kit. Dont but hybrid generic shit.
$900-$1500 on a decent exhaust.
Once you have done this u can buy a much bigger turbo and gaining power will be easy.
Bolt on, and ull regret it =)