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After removing the cat and installing a pre-muffler, I get the same popping on deceleration. Did you have a cat converter installed before the SSI's?
I think the popping is normal for non cat exhaust. Don't know about the loud bang. Might not hurt to have your air/fuel mixture checked.
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Don
24 Cayman GTS - GT Silver
23 Cayman GTS - Arctic Grey - Sold
97 993 Coupe - Arctic/Black - Sold
13 991 Coupe - Platinum/Black - Sold, 87 911 Coupe - Venetian Blue
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