I agree regarding the NISMO vs the other aftermarket brands. Most that I have heard, however, have either raspy and annoying sounds from idle or serious vibrations in the 3500 to 4500 rpm band. I would have loved to purchase the HKS system but I didn't and don't have 2 thousand dollars to spend, so I had hoped that the NISMO would suffice. Right now I have the stock muffler on the NISMO pipes and it seems to be ok. The person who said the NISMO is lighter might be wrong. I know that the NISMO muffler is significantly heavier than the stock 370 muffler. Perhaps the entire system is lighter but the muffler certainly is not. Interesting note, by the way, is that if look into the input ports of the stock muffler you see what appears (I am sure it's not) an open chamber while on the NISMO you see honeycomb steel with packing behind it. Also the NISMO outlets have a packing chamber in them while the stock outlets do not.
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