I am having problem with my PSE lately seems like the ON/OFF only works on 1 of the mufflers.

Car has the "ashtry mod" done already, when I have in ON (loud) mode
Driver side muffler has exhaust gas exiting from both tips
Passenger side muffler has exhaust gas exiting from the Outter (larger) tip


When in OFF (quiet) mode
Driver side muffler has exhaust gas exiting from both tips
Passenger side muffler has exhaust gas exiting from both tips

thus its the driver side that is broken (not switching).

Question being where should I check for the problem, at muffler or at the solenoid? The solenoid is controlling both muffler at the same time via a "Y" thus its probably not the solenoid unless there is blockage in one of the hose. My last fear would be something broke inside the muffler.

what do you suggest?