DO exhaust/intake/chip some of the basic upgrades get you up about 30 hp with them all depending on how much the chip helps I'm not familiar with chips for Mark V's at all.
Bulletproof Speed Hardware :: Volkswagen :: MKV GTi, Jetta, Rabbit (06+) :: 2.5 Engine :: Exhausts :: AWE 2.5 Catback
AWE tuning is pretty good, that'll add like 10-20hp I'm not quite sure.
For a chip GIAC or REVO are always a good route, I don't think APR makes one for the MK V but it's something to look into.
Bulletproof Speed Hardware :: Volkswagen :: MKV GTi, Jetta, Rabbit (06+) :: 2.5 Engine :: Intakes :: VF Engineering Intake
V-F Engineering makes a lot of good product for mark V's
Can't find a chip for now because I have to go off to class, but keep looking you'll find some here and there stuff. I'm not sure if upgraded cams/valves would help on a 2.5 engine, you'll have to ask around. Just use some of the links you find on this website and hopefully go from there. Remember, the search function on here is your friend.
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2003 Mark IV Bora 1.8T
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