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Exhaust Reverberation.

Featured Replies

What I have found is that thick-wall mufflers don't transmit noise up into the boot floor while thin-wall mufflers do.

 

An expensive aftermarket muffler for the Altezza will weigh twice what a Repco one will, the stock muffler having a triple-layer wall (fibreglass sandwich) and the current L-Sportline one having a heavy stainless structure. The RPS I had was just thin and light, and needless to say boomed right through the car.

 

You might try soundproofing the muffler itself...

 

A bit of reading here-

 

http://autospeed.com.au/cms/article.html?&A=0383&P=1

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