RC8 and RC8b are the same the B stands for buggy. But they did upgrade some parts.
Updated Items on the RC8B
1. 89290 – FT Threaded front big bore shocks $69.99 pr
2. 89346 – FT Threaded rear big bore shocks $69.99 pr
3. 89464 – FT Front Aluminum Shock Tower $29.99
4. 89465 – FT Rear Aluminum Shock Tower $34.99
5. Blue Aluminum Suspension mounts
a. 89460 – RC8B Aluminum A-Plate $17.99
b. 89461 – RC8B Aluminum B-Plate w/Pins $25.99
c. 89462 – RC8B Aluminum C-Plate $17.99
d. 89463 – RC8B Aluminum D-Plate w/Pins $26.99
6. 89242 – RC8B Steering Drag Link $6.99
7. 89021 – Updated Wing mount to fit 16mm shocks $10.99
8. 89003 - RC8 RECEIVER/BATTERY BOX $9.99
9. 89258 – Molded Composite front/rear chassis braces $5.99
10. 89473 – Steel-Alloy shock stand-offs $9.99
11. 89296 - RC8 83MM WHEELS WHITE $17.99
12. 89134 – Machined Alum racing clutch shoes w/shim $29.99
13. 89257 – Lightweight engine mounts $14.99
14. 89234 – FT Blue Aluminum One-Piece Top Plate $42.99
15. 89000 – Light-weight 3mm hard-anodized chassis $114.99