well its never quite that simple mate, first of all you would want to at the very least uprate brakes (discs, pads, braided lines etc) then look at suspension some coilovers, or shocks n springs coupled with some strut braces. then for the actual power increases, u would first want a good exhaust; HKS, Blitz, Fujitsubo, Kakimoto for example, u may like to use a FMIC if needed, altho TMIC will work upto 200bhp but can be inefficient. That is the breathing sorted then u can simply put on a pre-mapped ecu such as Mines, Blitz, SARD or JAM and you should be good to go, or alternatively a HKS F-Con, GReddy Emanage (Blue/Ultimate) or Apexi FC to take care of higher power needs. If u have a look through both the readers rides section and tech section it should help with ideas and answers.