well guys let me start with Chris at benchmark is a GOD!!!! he has heklped me sooo much. Come to find out this is a Grizzly sheave, and you do gain ever so slight, not worth the cash! The seller has lied to me over and over, started with i paid for the item on the 26th of feb and on 3-3-09 i emailed asking where it was at and if he had tracking, he told me it was sent on the 2nd, finally on the 6th it got here with a post mark of the 4th.....hmmmm maybe its me but my math isnt great but that doesnt seem right? next once i got to looking at it it looked stock, so i took mine off the rhino and with the two side by side i meansured them to find them the same. I called Chris and we got to looking at the casting numbers and BOOM there it was , Grizzly not rhino.... I emailed the guy over and over trying to get him to tell me the truth and I told him what i found out. HE SWEARS IT WAS MACHINED ON THE FACE!!!!? he also said that he has sold over 400 of these with no issues, so i brought up to him that his ad said 300, and if this is true why does he have a couple used for sale????? well i filed with paypal and will be sending it back to him monday, Chris is hooking me up with another... I plan to contact ebay cause this guy is comitting fraud....oh well I did install it to try it , and with my GPS i only got 47mph with my stroker motor and black rhino cdi..... no where near the 55 he said i would get. funny thing i was getting 45 before sheave!