The RTR B4.1 has the V1 unthreaded shocks & the FT B4 has the threaded version (they are otherwise identical).
The FT B4 also has better turnbuckles and the alloy front wishbone brace which are about the only upgrades you would need over the RTR versions.
Buying new radio gear and motor/speedo you would be looking around £160ish on top of the FT B4. You need to budget for a battery and charger on top of both options PLUS springs & tyres to suit your local track.
Edited to add - forgot to say the B4.1 RTR has a gear diff but the FT B4 has a ball diff
Last edited by peetbee; 18-02-2011 at 04:06 PM.
Reason: forgot about the diffs!
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