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Does anybody know how many HP you can get with standard S4 heads?

500-520HP, you wont see much more than that!

Any updates to this question/answer? For example if going for bigger turbos like straight RS6 or something similar? Still won´t get 520ish?

Doug got 550 on standard heads

We dynoed a french S4 with stock heads and lots of stuff done around that at 560 crank and 730Nm. more could be done but not sure how much more!!!

im watching dougs new project with interest

S2tuner wrote:We dynoed a french S4 with stock heads and lots of stuff done around that at 560 crank and 730Nm. more could be done but not sure how much more!!!

Sounds very good. So I assume this was done with std cams also? What kind of intake mods is required for that kind on power? The reason for asking is if I´d go for example GT2560r turbos would those be an overkill for the stock intake or could ~550hp be achievable with stock heads and cams assuming the exhaust system (and everything else) was done properly?

I´d like to retain the low end torque as much as possible so wouldn´t want to do the heads/cams.