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I'm running the TM 323 (Which is the same as the TM 523 except for the turbo plug and the sleeve) and it is sick fast.... Did I say SICK FAST? Which means that the 523 should be a bit SICKER.....:banana:
 
That would depend on what your doing with it. If your bashing and want top speed go with the 523 not much faster but it is. If your racing the o.s. has much more useable power and speed making for faster lap times.
 
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