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Old 10-04-2012, 02:18 PM   #41
APM Tuned
Former Vendor
Member#: 282460
Join Date: May 2011
Chapter/Region: MWSOC
Location: Villa Park, IL
2005 Evo-STI


Anything that is causing instability can cause knock as there is more than just a mechanical knock.

We just did a car with the same issue, he had a slew of parts he threw at it and tuned it himself and...well, received that whistle sound. He was surprised that this was the first thing we he purchased one and put it on...then came in with a Bacci 36 inch pizza and soda as a tip haha.

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