While I'm sure you will get arguements as to the legality of modifications to a stock tank, it would not be unheard of for someone to stuff the stock tank with fuel cell foam, or even insert one of the surge tanks that are available from Fuel Safe, ATL, etc.
In club racing you will find that the cornering is not as abrupt as Solo II, so fuel slosh may not be quite as big a problem.
One might even make the case that the fuel cell foam is a safety enhancement. (wink, wink)
Next time your at the track, see how many RX7s are running the fuel tank, compare that w/ your experiences in Solo, watch them run an hour between stops in an enduro, then draw your own conclusions.
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Chris Wire
Team Wire Racing
ITS Mazda RX7 #35
[email protected]