I don't know about the ratteling, but my car has the same Mac H-pipe, and I was told that the popping is merely the expanding and contracting of the exhaust. It happens after you let off the throttle, and when I first start my car in the morning it happens. I was told that this is normal, and was okay. Oh ya, mine also did this when I had the stock H-ipie and Flowmaster cat-back.
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I am only 17 so this is it for now!
1989 Mustang LX:
Cobra Intake, 65mm Tbody, 1.7RR, Mac CAI, 1 5/8 Mac headers, 2 1/2 Mac H-pipe, 2 1/2 Flowmaster Cat-back, 3.73s, BFGoodrich 275/40/17 Drag Radials.
2001 GT leather seats, 17x9 Cobra Rs.
Ricer Hater's club: member #48
14.185 @ 97mph (with AOD)
12-19-01
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