Mats Karlsson and his two brothers ran a self modified March in the 1983 Swedish F3 Championship under the "Swedish Lions" banner, the car took the runner up spot amidst a host of Ralt RT3s.
  
 
The TMS 833 preparing for an end of season race at Thruxton.
The TMS 833 began life as a March 803 with 813 rear suspension grafted on, the Carlsson brothers carried out some additional modifications themselves and the car proved competitive in the Swedish Championship. It would appear that the TMS only raced for the one year.
Drivers  
1983 Enzo Coloni.