I just had Circuit City install a Sirius Didital Audiovox PNP2 receiver in my 2004 350Z. I have the Bose HU, JL 300/4 amp, Infinity & Kenwood speakers + an Infinity Basslink. Everything was running perfectly until the PNP2 install. I love the Sirius programming. However, everytime I shutdown the ignition (even w/ the PNP2 & HU alreadyoff). I hear a delayed popping sound at the rear. Circuit City said it was the amp shutting off. It never happened before so they must have done something with the connections that is causing it. Any assistance from anyone is EXTREMELY APPRECIATED.