Grubb
forum member
Grubb, as you have seen the Roush... what is the thing in the pic below? I didn't see that in any of the cars I have seen or driven.
Talked to a Roush mechanic and it adjustable exhaust, there's butterfly's on the inner tips on each side that can be turned on or off or programmed to opened at specific rpm ranges. He said it will eventually be a part of Roush production.
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