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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
What he said!

Also, I suspect that with a T3 the tubing area cross section leading the turbine on the aftermarket headers can be quite a bit larger than the T3 inlet's cross section area.

Thus, the tubing has to taper down significantly before the turbo and very quickly.

On a T4 the taper and acceleration of exhaust gasses happens more in the turbine housing and in a more orderly manner.

This is a guess.
Old 11-02-2010, 07:38 AM
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