09-13-2017, 10:49 PM
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#10
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Senior Member
Join Date: May 2013
Drives: 2013 FR-S, white, MT
Location: Puyallup, WA
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Quote:
Originally Posted by mjfulk
Wow, thanks so much for the quick responses. From what I can tell its rpm specific but since it's only present in a relatively small range I can't say that with any level of certainty. From what I can tell the video sounds similar to my noise. Do you know what the cause was? Since it was present when stock I've been assuming it wasn't related to either the tune of headers. The headers do not have a heat shield but the under panel was reinstalled. All other exhaust pieces are stock. I'm located in Cheyenne at an altitude of roughly 6,200 ft. Stupid question but does high altitude reduce the risk of knock. Thanks again for all the responses, I really appreciate it.
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It's my understanding that, on newer engines at least, the tendency to knock is less at higher altitudes.
humfrz
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