I have both the HPI and the Hot Bodies.
The HPI was purposely designed for the Savage and have:
- A different black plastic case in order to have the connection for the rotostart shaft sitting higher.
- The HPI unit has a shiny liner while the HB gear doesn't. I means the HPI will have less wear because the gear doesn't turn strainght into the plastic case.
Goto this page to see the different rotostart configuration...
https://ssl.kundenserver.de/s3892536...iew.shopscript
Starter shaft is longer on the HPI version in order to be able to reach the rotostart case throught the Savage bumper. With the HB, you won't be able to do that.
Hope this help
DFF