My car has the Supersprint CATs and intermediate pipes on, but the standard back-box. I do have the Race back-box, but am unsure about putting it on, as I am enjoying using the car for long distance driving.
Obviously my question is, how much louder inside the car is it with this on? I don't want it to be any more boomy than it already is? Is it bearable?
Obviously my question is, how much louder inside the car is it with this on? I don't want it to be any more boomy than it already is? Is it bearable?

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