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How many HP and Nm it is possible to reach with stock exhaust?
And is it possible to get 350 HP using k26/27, bigger injectors and IC, but with all stock exhaust?
Yes, if you are talking from the exhaust manifold (EM) back. It is recommended to go to an RS2 EM if you are making more that just 270 or 280 crank hp off a chip (with the K24). If you add a bigger turbo, e.g. RS2 turbo, you should change the EM or increase the risk of burning valves on no. 1 and no. 5. After that, the stock exhaust system is good for about 400 hp without being restrictive. However, many people change the exhaust because they want more sound.
Personally, I have brought my 93 S4 (AAN) up to RS2 spec plus (MRC software) and have dynoed 350 reliable crank hp. I like the quieter stock exhaust - it doesn't cause head turning when you put your foot in it on the street.
RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avant
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