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      04-16-2012, 03:34 PM   #6
kitw
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Drives: F91 M8, 991.2 GT3
Join Date: Jun 2007
Location: Bay Area, CA

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Quote:
Originally Posted by Trevor .:R View Post
Hey guys i had a custom axleback installed past month, and i have a slight whistle or blow off valve sound at 3800-4500 and it annoys me alot and you can hear it on rev. I had 2 exhaust shops check welds and no leaks i do not know what to do =( the previous owner did not have this problem on his car. Thanks for the advice in advance!
I would get the car up on a lift and rev it, and hold your hand near the different joints. You should be able to figure out where it is coming from.
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