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The Power Commander V for the Benelli TNT135 will almost certainly work. That was what I was going to use with the RX3 and 300cc kit.
I know there are some who say you don't need a tuner; my Dyno tuner disagrees strongly. The ECU can adapt somewhat on its own over some of the rev range (generally part throttle and low to medium RPMs) but when in open-loop operation the ECU cannot adapt to the larger displacement, so it ends up running quite lean at full throttle and high RPM. Those who say that they got a boost from the big-bore kit in the mid-range but nothing on the top end, would seem to be confirming exactly that.
If doing a 300cc kit, I would highly recommend getting it tuned or at least using the wideband autotuning kit available for the PC V.
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