Please help me out. I'm aware that for the QPV 4.2 auto there are no external valves in the exhaust box. However, thanks to previous members gutting their boxes we know that there is a spring loaded baffle inside which is forced open by exhaust pressure. Under low revs the baffle is closed and the exhaust is routed through the box and subject to attenuation by the wadding etc and exits through one of the two exhaust pipes. Under higher pressure the baffle is forced open allowing the exhaust to bypass the attenuating path and exit through the other exhaust pipe.
So my question is, why does the volume increase pleasingly when accelerating or under load, but then tail off even though the revs are up?
Eb
So my question is, why does the volume increase pleasingly when accelerating or under load, but then tail off even though the revs are up?
Eb