The TC is the current production model available in the Cyclone lineup. You can still find the older versions if you look around. Best "bang for your buck" in the world of competition touring cars has to be either the Cyclone TC or AE TC5.
TC Improvements over previous Cyclones
- from Hotbodiesonline.com
Pro Spec Ball Diff in rear - IMO the biggest improvement.
HB Two-Way front one-way/spool
Larger 18T center pulleys
FRP middle block deck for increased rear traction
Revised main chassis for improved weight distribution
Altered upper deck with provisions for HB ATC (Adjustable Torsion Control) posts
Stronger upper bulkheads for improved crash protection
Thicker low-mount shock towers to fit extra-low bodyshells
New reversible suspension arms with more suspension mount options
Easy-adjust sway bar holders for fast fine-tuning
Moulded battery tray for easy fitting of batteries
Extra-efficient universal dogbones
Fantastic lower price