I have no way to check, but another owner on another board saw between 2 and 6 degrees with the 3.4 pulley. His last run at the track with a 3.2" pulley saw just a couple of degrees at the very end of the run....not a real issue. Certainly cooler air and good fuel are a big help.
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2004 GS GTP/WS6
3.4" puley, BIG conical K&N filter
14.22@96.5 mph