How could I increase the horsepower on my car?

I have a jetta 2003 and i would like to give it a little boost. Ive heard about changing headers, and all the escape tube and even putting an intake. How many HP will this increase and how noticeable would it be? What would you recommend doing to this type of car? What kind of headers and is there a web page i could find all this? Jetta 2003 the normal one, A4. How much would i spend on this? thank you!How could I increase the horsepower on my car?
What engine? Turbo or V^ or 4? headers without new intake and exhaust will not add but maybe 1-3 MPG and 5 HP With rest will get 5 more MPG and 20-30 HP and if shorty headers same torque. If not turbo do not add as you will have more money in mods needed then car cost. add all sythetic fluids as a lot less friction will give up to 25-35 HP and add life to engine for about 175.00 for all like Engine, tranny, rear end, steering fluid and brake fluid.Adding 30-40 torque to car will be a very noticable increase especially with Jetta. Turbo without mods may not give but 10-50HP and car will be unsafe and need constant attention with suspenion and brakes as well as over heating and aixles. Cost is 3000+ whereas other is 1000.00 and will work and not void anything as well as car will last longer.How could I increase the horsepower on my car?
You can do what the other guys have said to do. However, I can't honestly answer your question without knowing what type of motor you have in the car...



If it's a 2.0:



There's not much you can do. The 2.0 in the VW community is affectionately known as the 2.slow. You can try putting a CAI and an exhaust on the car, but it will be futile.



However, if money isn't an issue--if you can find one, get you a 1.8l 16v head from an A1 or A2 GLi or GTi. Then get a small turbo like a Garrett T3/T4, a CAI, turbo back exhaust, and a performace chip or a standalone ECU like the MegaSquart N' Spark.



If it's 1.8T:



Simple. The great thing about the 1.8T is that it's very easily modified. To get some quick HP/TQ try: a CAI, header-back exhaust, performance chip, better intercooler, and maybe even a larger turbo.



A combination of just a CAI, exhaust and chip will you net you another 70-120hp.



But remember, you can get all the power you want, but if you don't have the suspension and the tires to get to the ground, it's worthless.
HEADERS WONT DO ANYTHING. Now a days headers are already shaped for max flow. My buddy spent a ton for his headers and to install them and you couldn't even tell. If you want some good power for under a grand get a chip throw in an exhaust and KNN cold air intake if you got the money. Or of course if you have 3 grand get a turbo or supercharger
the cool air on those sounds very good i would recommend that with a full exhaust kit

best place for any euro cars is

http://www.neuspeed.com/home.asp?ltype=ns_euro
Depends on your budget and what type of engine..

Try turbo charging it if you got money or get a performance chip or a cold air intake