yep...

measure the hot air temp near the furnace.....

stick a thermometer in the duct somehow...

if it is much over 120 deg F after the furnace has reached full temp...
then a faster blower may be a good thing for you.

But if you don't REALLY know how to re-wire it, you can create
problems...

make sure the saftey function still works,, if the furnace overheats,
the furnace must turn off and the blower turn on...


Mark