I'd have to agree with Carl Andy, you already have a very good car that will get even better if you stick with it til next season.
It's always tempting to try something else as we all love trying something new, I for one was tempted in trying a TM2 recently but let me tell you that I've gambled before and the grass was not greener on the other side.
If you are intent on changing I would try the TM2, it's cheap and very quick from what I've seen but is more suited to higher grip tracks similar to the Rb6 you already have.
We all know that the RB6 isn't the best in low grip but I've managed to find a good low grip setup recently even using the standard saddle config by adding weight etc. for Southport indoors the standard rb6 would be fine and strong which is always a bonus indoors.
Chris
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