Are there any chips available for an 07 s4?

The chip on a non-aspirated car isn't going to give you that same results as one on a turbo car. You could simply end up making your engine run rough and shortening its life. There is more power that can be gotten out of the 4.2, but it's not really done with a chip alone.

Look at the different components on the RS4 vs the S4 to see how to tune the 4.2. Its chip is different, but that alone is not where the 80 more hp is coming from.