i liked the super better. it will pobably 60 foot as good with some tuning. but i bought my 950 vacuum the first years i saw the hp series show up in speedwaymotors.com i tried a 950 dbl and slowed a tenth in qt but i didnt try tuning . it could be that a 950 dbl was too much but a 950 vacuum was good . maybe it would of liked a 850.