The increase in engine noise comes from a few different sources.
First, there's a modest increase in timing to help improve fuel economy and performance. This isn't too aggressive, but it will definitely make a noticeable change in engine sound.
Second, there's the change in ICP. This makes for a slightly hotter combustion and also slightly advances timing as well. This accounts for the increase in engine sound as well.
Take care.
__________________
Bill Cohron - The Mad Doctor  
Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1997!
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