Quote:
Originally Posted by heinzena
If anyone is curious, I was able to get my dealer to use their software to open the flap, and unplug the servo wires. Flap is now always open. Looks much better having exhaust exiting both pipes. From a sound perspective, it does sound a bit throatier, especially on start up. A bit of a drone on the highway though. Could be my imagination, but I feel I lost a bit of low-end torque.
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The velocity of the exhaust should decrease and can have an impact at lower rpm. The purpose of the flap is to increase low rpm exhaust velocity by restricting the flow which helps create a low pressure scenario at the turbo, which helps it spool faster.
Ferrari has the same concept except they have two down pipes rather than the flap.
Generally the impact is slower spooling on the turbo which should impact your times and low rpm performance.
It'd be interesting to see some dragy comparisons.