11-02-2015, 02:18 PM
Whilst you can go much bigger on a turbo car after the turbo as gas speed isn't much of a concern, you can actually slow the gas flow down so much at low rpms, that it slows down, cools and increases the pressure rather than reduces it - which is probably why the guy is suggesting a tapered system, 2.75" from the turbo feeding into a 2.5" system after the mid box would be more than enough.
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