Hello everyone,
I own a 2001 Audi S4 tiptronic, the car is in mint condition as it only get driven once a month and is garage kept. (32K miles)

Performance upgrades are:
- Custom made down pipes with high flow cats
- Miltek cat back exhaust
- Apr chip

The car runs well, however, I am seeking a bit more HP.

My question is:

If i was to switch out the K03's to K04's and get the proper tune, will the car run right or is there something else I need to do it? I am looking to gain about 30 to 40 more hp. I do not want to go all out and crazy with it. Will switching the turbos and getting the proper tune/chip do the trick?

Thank you.

 

Wow, we never talked about this...
https://www.audiforums.com/m_406711/tm.htm

Short answer, yes, you can just throw in K04's. You will get more then 30hp from them.

You can get 30hp from getting a GIAC flash, then LEMI it, then throw some IC's on there.