Quote:
Originally Posted by Stingray
On my manual trans C7, I can prevent V4 mode by simply not using it in Eco mode therefore the pre-muffler exhaust valves are open. When they are closed (in Eco mode in my car), exhaust gasses still pass through since there is a small orifice opening in the valve, kinda like a diaphragm.
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Are you sure about that? I thought that the Eco setting forced V4 but the Tour setting switched between V8 and V4 (Normal and Eco) dynamically, which means you're not preventing it at all, right?