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Hello I am new here , I am from Slovakia so please sorry for my bad English .

I had an S3 tuned to about 330 bhp and I have bought a b5 rs4 maybe 6 month ago . When i bought it RS felt like less powered , it was not what i really expected.
Two weeks ago i was on dyno with RS4 and measured only about 340bhp .I put it on a VAG and mechanic told me that turbo pressure is OK , turbos are okay but he told me that ,,pre ignition,, is 10 degrees forwarded . The car should be on chipped by sportec so he told me , that power loss is caused by a bad map. What do you think is wrong ? Audi Forever Thanks

Welcome to the forum, Stuff.
Sorry, can't help you with your power problem but I'm sure someone here can.

Sportec definitely do decent tuning. I hope you're using at least 98RON fuel, otherwise, this could be the cause for your loss of power.

S2tuner : I naturally do. 98RON Agip fuel.