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The throttle body alteration for Audi 2.8L V6 12V is composed of dull the first venturi to provide more airflow at lower RPM's. About 28% more air is flowed at 0.33 throttle, which adds up to about an eight hp gain. On a stock engine, this alteration loses the low Revs per minute "doggy" effect, which is widespread on these engines. We feel this is the most serious performance improvement

The Audi A4 is a compact executive automobile produced by the German auto manufacturer Audi AG since late 1994. The primary generation A4 succeeded the 4 prior generations of the Audi 80. And just like its Audi eighty predecessor, the Audi A4 vehicle layout is composed of a longitudinally orientated engine at the front, with transaxle-type transmissions mounted instantly to the back of the engine, again, orientated longitudinally.