| 1. www.pratherracing.com | Prather Racing/ MG & Mazda Rotary |
| 2. www.bertilsengines.com | Bertils Racing Engines/ VW |
| 3. www.raceengineering.org | Race Engineering/ Spec Miata Engines |
| 4. www.mazdatrix.com | MAZDATRIX/ Mazda |
| 5. www.hayesrotary.com | Hayes Rotary/ Mazda Rotary |
| 6. www.trrotorsports.com | TR Rotorsports/ Mazda |
| 7. www.yawpower.com | Yaw Power Products/ Mazda Rotary |
| 8. www.speedsourceinc.com | SpeedSource Race Engineering/Mazda EP,GT,IT |
| 9. www.butlerengines.com | Engines by Butler/ FV, FF, S2, F2000, Vintage |
| 10. www.appliedracingtechnology.com | Applied Racing Technology/ Spec Miata Engines |
| 10. www.SpecMiataEngines.com | Spec Miata Engines |
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