I've driven CRC pantoura 200mm and 230mm wide CRC conversion kit from PRC, until about 8 months ago.
With 10.5BL and 7.4V Lipo its not as fast as a TC with 3.5 BL down the straight, rather more like a 5.5 type motor. It is much faster in corner speed and they have incredible handling in and out of corners and overall lap times are as fast as 3.5BL TCs.
So I dont think a 200mm pan car is too much to handle with 7.4v and 10.5BL. Just the opposite, they are much easier to drive with that combo than any mod TC, or even 10.5BL TCs.
I'll be getting a CRC or BMI soon and start running them again and hopefully start a class at our local track and take it up to MDI and talk to Tim Potter and see they'd like to run them also...here's what we'd probably do:
200mm Pan Car w/ 200mm GT bodies or GTP style(like Serpent 200mm GTP body)
Classes:
-10.5 BL & 7.4v Lipo or 6 cell Nimh
-13.5 BL & 7.4v lipo or 6 cell nimh
Budget class:
200mm Pan car w/ Gt bodies, and Novak XBR w/ 10.5BL EX Sport brushless motor system- $150 for combo.
Or even cheaper:
200mm Pan Car w/ GT bodies, and Black Can motors and novak GTS or LRP $45 ESCs that run up to 19T motors...ESC and motor= $65!?!?