I noticed the same thing when I got my art pipe with the nismo exhaust. it's an annoying rasp not a good rasp( at least mine was) hated driving so I started looking into it and basically there is no break in period any more with the new versions. I called tony and he explained that was only on his older models.
so I got an exhaust and it changed it but it's still slightly there just a manageable tone now and I like it.
one thing that could change it tho would be getting a tune because of air fuel ratio being off.
Personally I think a tune is a must after the cats come off.
just what I think
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