I thought I had a minor exhust leak because of an annoying resonating sound coming from the glove box area but did some research and found out it was the fuel damper. Went to Infinti and bought a new one for $175CDN and installed it myself. It only takes about 20mins and that annoying sound is gone. There is a TSB out on it and funny enough the parts guys knew exactly what it was without looking for the part #. Anyway any one wondering if they can DIY yes you can here's a link to help you out. Part # 22675-AM60A or B. Works for the 350Z as well but oddly Nissan sells the part for $195?? Hope this helps someone out.

http://www.alteredatmosphere.com/man...ion_Manual.pdf

 

Link doesn't work. I think I might have the same thing on my 03 coupe. The exaust keeps making a weird noise after warm up at idle. Doesn't happen when I'm running just idle. Haven't taken it to the dealer hoping I might be able to do it myself but any info helps. I forgot to mention that my shift **** feels like a grinding machine and knocks a bit.