Exhaust Design Article By Garrett Engineer

[GTR32]

Yep that’s right. If you have a 2.5 turbine exit, the dump pipe should gradually increase in diameter (7-12 degrees) till you get to the size of the exhaust you want ie. 3 inches. This is known as a diverging (as opposed to converging) nozzle which tries to “suck” the exhaust gas from the turbine exit using compression waves.

In reality it all depends on practicality and if it’s a prick to make ($$$).

Hi Ustasa;

sounds like you've been down this road, have you got experience with an exhaust made this way?