I recently got into slot car racing, and the motors we use to race them are the same motors we all use in xmods. Here is a site that sells good slot car motors, Look at the JK Falcon III, its turnin at 46,000RPM. Don;t have one yet, but my slot car and my XMOD will have one. The only thing is that slot cars use the opposite end we use, unless it is a shaft drive from the front. Heres the site
http://www.professormotor.com/cat_motor.shtml