Well let me just open with i no jack about cars and need some help.
I recently bought a Silvia S15 for my first car stock 147kw and want to get it up to 280kw though unsure of what i exactly need to do to get it to that. I currently have $10-15 (AU) Grand to spend and no jack about what i need to do.

:)

First off, Do exhaust and intake. None of the crappy cat-back stuff, get a straight pipe. Then get bigger injectors, a fuel rail, and a fuel pump. Suspension next. Then you can do many things from here:boost controler, gauges, bore ur enguine out, try to find a better turbine kit, front mount. The List is endless, just depends on what you want to do with your car.

What do you want it for?

Daily driver? Or drag? or drift?

Maybe just a turbo kit and intercooler from HKS is the best place to start in getting to 280.
Of course you'd need air intake manifold and full exhaust system.
The Turbo kits comes with BOV wastegate but you'd need to buy an intercooler kit too.

New tyres and rims should also be on the list and also a good choice of brakes and suspension wouldn't go a miss. Maybe a new clutch too.

Daily driver/drag .

HKS have everything you need
so does JUN

best place to go for a pretty comprehensive list is www.takakaira.co.jp
Though you might want to look for cheaper places to buy after surfing through


topsecret also has Silvia S15 stuff