Paul, if you're looking for an inexpensive tire for your Challenge car, I recommend you tkae a look at the Sumitomo HTR200. Those may be my race tires for this season, if I don't spring for Kumhos. The HTR200 seems to be rated well enough by customers (although it seems that they need to be broken in well) and I've had a few personal recommendations from people in the know (tire rack, racers, etc).
The HTR200 is cheap as ****. I haven't looked at prices for SVX sizes, but for my Justy they'd run $40 each.
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