Hey Fellow Audi owners:
This is my first post, so hello!

I just got my S4 a couple weeks ago; its the 2001 tiptronic 2.6l V6 bi-turbo. Coming from a Honda Accord, this thing seems like a monster already, but.....

Anyways, I also bought an extended warranty, which I hear pretty much rules out any significant engine mods, so.....that being the case, are there any mods that could possibly be done to add horsepower, that wouldn't jeopardize the warranty?

Thanks to anyone willing to respond a help a fella out.