We currently have 180 quattro and are planning on getting a 225. What are some mods that we can do to it? I have heard of chips, exhaust, and other things, but what is really out there and how does it affect your warrenty? What are names and sites for these products too? Thanks.

You can concider the following

Chipping: APR, Neuspeed, and you can have the chip remapped not sure who does this. will increase to 265 hp or so. (warranty will be voided if you have any major problems and the audi techs have to check the chip)

Intake: Neuspeed, K&N, TTstuff caries the K&N one. (will void the warranty if left in for service you can always remove it before service 30 minute job)

Exaust: Borla, Miltek is a good choice. (most definitally will void warranty)

Blow Off Valve DV: no Hp increase, kinda dengerous to the turbo. (will void the warranty)

Brakes: Brembo, BEAR, a good upgrade (will void the warranty)

Suspension: Helps the look and the steering (again will void the warranty)

Rollbar: A geat upgrade. this is a bar under the car that effects the over all steering of the TT. You can upgrade the rollbar to a passat 19mm will only set you back 80-100 bucks form the vw dealer.

Besides that, Audi does not have the concept of making a car go faster and stop quicker and will find any and everyway to stick you with the bill for a modified tt. I would reccomend either making good friends with your audi service guy or keeping a brand new TT stock for a while. And to all the places you need to find the stuff, you need to do some research on your own for the best prices and offers.

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Do you know of any web sites where I can check out some prices for the items listed above?

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Life is a game of inches

try:
ttstuff
gtt uk
neuspeed
vag parts

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k04 turbo neuspeed makes it. or go to www.ttstore.com they have inercoolers as well with intake and other crap

Dont go with the k04 i heard the GT28 turbo kit by "atp"(i think thats the name of the maker) is alot better

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Lookin to buy a TT as of right now