check the excel section on my website, there is a chart in there.
Basically, the blocks are actually quite logical, once you get your head round it. The reason for the (slightly) odd systems is that the X series came out after the 2004 worlds, and Tamiya had been using A, B, C etc for marking the block width on the 414 for at least 2-3 years already... would have been more confusing to change it...
Anyway, from narrowest to widest. Each block gives 0.5° toe difference,
XD, XC, XB, XA, X, A, B, C, D, E
For two degrees on an Evo5, try A/E or X/D (Front Rear / Rear Rear). X/D will give the car (slightly) more grip on power, and allow it to rotate quicker in the middle of the turn, as it has a narrower track width (distance between the tyre centre lines).
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