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Old 10-04-2012, 01:18 PM   #41
APM Tuned
NASIOC Vendor
 
Member#: 282460
Join Date: May 2011
Chapter/Region: MWSOC
Location: Elmhurst, IL
Vehicle:
2005 Evo-STI
R.R.-WRB

Default

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 mentioned...so he purchased one and put it on...then came in with a Bacci 36 inch pizza and soda as a tip haha.

-Mark
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