altezzaclub Posted June 16, 2010 Report Posted June 16, 2010 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 Quote
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