The car looks great, i think it was one i was interested in but it was too far away
I think a lot of guys have upgraded to the 4g63t, but im the same as you, just want to have a little fun without having to buy shares in the fuel company!
Anyway i asked a similar question not long ago, this is the reply i received from Dave_GSR1.8
Improving you GSR but staying incognito...
If you are after just a moderate power increase with some handling improvements in your GSR you can do this without drawing attention to yourself, these are the things you can do;
- fit a bigger rear sway bar - whitleine 20mm is one option, dials out understeer
- fit caster correction bushes to the front, these add more caster for increased dynamic camber
- fit camber adjusting bolts to front wheels for more static camber
- fit a bigger turbo back exhaust, just keep it as quiet as possible!!
- fit a bigger AFM (609 or 055), injectors (eg 510cc)
- fit a bigger turbo (16g as you have mentioned above) and set max boost to 15psi
- fit a front mount intercooler behind the standard bar (remember, incognito!!)
- chip the ecu (eg ecm link) or fit an evo ecu, I can't remember the exact details for this second option but plenty of info in the forums
- fit some green stuff brake pads (or do lots of research to see what else is out there)
- replace all suspension bushes not already touched
- fit a short shifter
All this should take you to around 160kw atw (give or take a little, depends on so many things) with improved handling and stopping and... most importantly... your car still looks completely stock!
Edited by mat, 06 August 2014 - 08:59 PM.