When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I have the same thud. Only when I take off quickly and punch on the gas. I had it looked at when I went in for service. They told me that my E-brake cable came loose. They tightened it, but I still get that same thud. I have learned to live with it until my next service when I go crazy on them to get the damn noise fixed.
hey, i am new here, i have a new 2001 M3 and it also makes the thud sound that you described. its normal and i was told because the M3 has the new LSD. i am note sure about the IS300 but should be normal since most of you are having the same sound and is from the rear, so i am guessing is from the LSD. Just take it to the dealer.
anyway, i have a quick question for anyone to answer. does anyone know the compression ration for the IS300 ? thanks.