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Probably AFM... Mine is sort of a groan sound between 1500 -1800 RPM. The fact that it's going in and out of AFM and I know it is what drives me crazy... The sound is very mimimal.
Definitely not a loud system until you go WOT... then it wakes up. I waited on Headers because I didn't want to get too loud but now it looks like I can have my cake and eat it too as I do want the extra horses that headers will get me.
Should be a good combo although AFM may get worse unless tuned out...
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