Modifiying my K11 1.3L

Hi, i have my micra from 2 weeks.Please tell me the cheapest way to increase the HP.I'm planing to change the all exhaust system and change the air box with K&N K57i kit.What also i have to do that is not very expensive.Sorry for my bad english.Thank You.
 
janspeed manifold is best performance for your cash, K&N 57i will produce less power than the standard air box with a replacement panel filter
 
Thanks for the quick answers.Is the change of throtle body from GA16 engine is worth it.If is do i have to change also the injectors and the ECU.I can buy this things cheap.
 
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