vtraudt

Still trying to figure out where the true and severe bottlenecks are in the 2.7T air supply system.

Example: Bi Pipes.

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First side note: any increase in volume between the turbo outlet and the throttle body will actually REDUCE boost response (yes, there is a draw back for those huge intercooler pipes, big intercooler cores, etc.)

That a side:
what is the ID or cross section (if not round) of the stock 2.7T bi pipes?
Anyone know the dimension of the RS4 (2.7T) and RS6 (4.2T) bi pipes?

In this contect: ID/cross section of the intake Y pipe of
S4 2.7T
RS4 2.7T
RS6 4.2T