PeTe,
Rattley sound is not good. I would concentrate checking for sound around the AC compressor or alternator or anything that has a bearing in it. Worse case, listen around the turbo housing. I had a turbo go bad on a volvo I used to have and the compressor vanes started scraping on the walls of the housing making a high rattley sound.
Good luck
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 '03 Inferno Red GT, 5 speed, STAGE 1, Mopar BOV, Plastic Intake, Modified Upper and Lower Airbox, Custom Airbox-to-turbo pipe, Borla dual exhaust, Maddog Short Shifter, Drilled/Slotter Rotors, Ceramic Pads, chrome wheels, chrome door spears, AMP chrome fuel door, PT Cruiser 3rd light diffuser, H&R Springs, Rear Sway Bar added, MGW chrome door lock pulls, Blane's hood struts, Custom license plate mount, some interior dress up stuff...more to come
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