Anyone know anything about the air chute kit part# ah208382 from deere. Just purchased a 9650sts, have noticed on a few other 9650s and all 60 series I have looked at are equipped with these air chutes in front of the chopper. What is their purpose? Are they worth the $300 plus they cost? Have run a 9500 for the last 17 years so I know little about these sts machines. Thanks..