ive got a my05 wrx and i want it to be a littlebit faster, its 178kw @stock(i think..?) and ive got an exhaust so i think it would be about 185-190kw hopefully..

i dont know the first thing about mod's really so i was wondering whats a good chip to get , how much it would cost(hopefully about 1500) and how much benefit i would get out of it..

another thing is would it void my subaru warranty..they gave me a 21 month warranty of which i still have 20 months left.

if theres a better way to add power to my car that doesnt hurt my wararnty then im all ears.

sorry for being so vague, any advice would be appreciated.