How can I achieve more HP without risking the integrity of the warranty or the car???

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I'm saving all my pennies to go nuts on this site someday!

there are not too many options you can do to the 4.2, but below are some, others may add more

1. exhaust, adds very little hp but improves sound :)

2. i think there is a chip out there that removes rev limiter and speed gov.

3. there is a supercharger kit out there but the application may be limited to s4 v8 only -- this will run you around 15k if not more

4. invest in a CPO S6 -- they are going down in price like a land slide, gas mileage will be similar to 4.2 (slightly worse but not by much - from what folks have commented on the forum)

5. invest in an S4 -- smaller package similar hp engine, you will notice a difference. You can pick up plenty with NAV and 6-speed so if you do not mind the space loss and depreciation hit on your 4.2 this is a good option.

I couldn't get over to huge depreciation hit -- dealers were only willing to give me 34-35 for my 4.2 :( so i'm keeping it until the new s4 turbo comes out