Question about hiss
After a few heat/cold cycles of running the Z since the FI install this morning, I detect a slight (faint) high pitched hiss on decel. Nothing like what you hear from HFCs. Just wondering is this is normal, or perhaps the sign of a leak (I always associated leaks with a ticking sound). The sound seems to be coming from area of the stock cats.
Just wanted to get some opinions before I jack up the car and crawl back under.
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Rain, snow, sleet, hail: 2009 Mazda 3 sGT HB
Everything else: 2009 370z, PW Touring 6MT
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