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Sound proofing back panels after Dansk Design Exhaust silencer upgrade

BruceLee911

BruceLee911

PCGB Member
Recent upgrade of exhaust silencers to Dansk Design. Externally they sound great and seem to add some HP. Internally they seem to have added some minor vibration and overall dampened additional noise (was expected). Is ok for short trips but longer drives can become annoying. Was wondering if anyone had added, additional sound proofing material to back of car beneath seats and behind side panels? I know hi end conversions such as Singer and RUF often add lot's of additional sound proofing material to decrease cabin noise based on increased engine and exhaust DBs. If so supplier info, or tips? Pre cutouts or general sheets to purchase?
Cheers.
 
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