There are only a few options that are true bolt off and bolt on with no other changes.
GCG Hi-flow is a direct swap.
HKS GT-RS kit comes with new lines but otherwise bolts up in the same spot.
The Hypergear Hi-flow are usually bush bearing (unless you specify otherwise) which can come with different specs but they may require a new oil line.
Most other options will require changing the dump and/or intake and/or heatshield and/or new lines.
The pick of the bunch for what you want is the GCG Hi-flow with a neo turbo/OP6 housing based on price and simplicity or refitting and proven results. (All moving parts are replaced so they are a new turbo)
Engine management is the key so getting it all tuned with a Nistune is the most cost effective way of getting the most out of your current set up.
Keep in mind you should also have a 3" exhaust, FMIC, decent boost control, fuel pump and possibly will require new injectors to get the most out of the turbo upgrade.