Quote:
Originally Posted by GTR_Steve
With the valve open or blanking plate removed the vast majority of flow is straight through. The section prior to the valve is flow sculpted so you do still get a considerable amount of gas flowing through muffler.
I would say the valve is a good buy, however it is vacuum to close so when you start the car v noisy until vacuum is sufficient to close.
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Thanks, that clears up a good amount. Id want it open so I may not even have to run the vacuum line at all.