to my knowledge most online sponsorships where you pay money, never work. and those people that get sponsorships (full or part) usualy have done a CRAP LOAD of work already to make it show-worthy/ race-worthy and if sponsored for racing, they have already proven they are a worthy driver.
good luck getting sponsored though, if you do get sponsored, you have to remember that they own you.
widen up the exhaust system though, and if you don't already have a turbo ECU , then get one if you have a 4g63. what year / engine is your galant? the title says 4g63, and you said 4g64. you do kno that those are fairly different engines right? If you are confused as to what direction to go next, try getting on the 3g eclipse forum
www.club3g.com since all GS/RS eclipses of that generation have the 4g64. Otherwise if you have a 4g63 sohc...? then dsmtuners.com should have most of the info you need.