Welcome to the best forum in the universe Sampson80, if that IS your real name. (Just kidding) I don't know about cooler temprature, but they will be cooler style and sound. V&H are great! Not sure why dealer reccomended them, maybe they carry that brand? My dealer reccomends Rhienhard's probably because he carrys them.
You might want to take a few days to watch this web site. You'll learn a ton! When you upgrade pipes at the dealer, I am certain they will also do a download to your bike so they run right. A lot of guys on here run a Dobeck TFI instead of doing the download. It's about the same price, and you can dial it in. And if you make other changes later you can adjust to those changes instead of another download.
Welcome - and dig in!