2003 GTI mods-what can i do???

i have a 2003 GTI 5 spd, fully loaded and i'm looking for more hp's and torque.
i'm new at this whole performace chip thing, i don't really want to modify my exhaust, i was researching this and i found at Stage 3/o2 chip what it does it modifies the air/fuel ratio signal.

i want more hp's but i don't want to hurt my engine or start causing problems, because it runs great now.
anyone have any other ways i can get more hp's, with out hurting my engine life or tranny?????

any help will be appreciated.

Check out what APR has to offer. http://www.goapr.com


I probably wouldnt mess with the o2 stuff. Get a good ECU chip that re-maps everything. It will run good, and shouldnt have any problems. Ive been running a chip in my 1.8t for about 5 years now, no problems at all. Clutch and brake pads might not last as long... but thats the fun in it!

Hey yeah thats what i thought when i was reasearching it, thank you
ECU chip eh, whats a good one? this apr site are they good?
i was wondering what your running at (h.p's/torque) after you put the chip in?
did you use the apr.com for yours?
thanks for the help, i just want to make sure everything will be good after i put this chip in.

p.s do i have to get it professional installed? do i have to get it programmed or dyno tested after ???

You have it flashed into your ECU, and I personally think GIAC chips as better, APR is really good as well though.
If you don't mind noise, you can also get Techtonics (or similar) turbo back exhaust, and a cold air intake. If you are afraid of sucking in water, then you can get an airbox (such as the eurosport one).
Have fun.

Fore chips like these guys.
Will give you good info.
http://www.ecodetuning.com/home/