🏁 Quick Facts
- Factory turbo-charged C-TEC4 660 cc liquid-cooled 4-stroke triple in Touring/ZR-based chassis. ~110 hp (later spec listings).
- Introduced for MY2004; base T660 Turbo and Turbo Touring variants.
- Period tests note some turbo lag but strong midrange pull; quiet, efficient, long-legged trail manners.
- Widely credited as the first production turbo sled (and first turbo 4-stroke).
Why It’s Revolutionary
Before Sidewinder-type rockets, Cat lit the fuse with a boosted touring sled. A factory turbo on a four-stroke changed expectations for reliability, fuel economy, and altitude compensation with real pull when the boost hit.
It broadened the idea of performance beyond 2-stroke piped screamers and normalized OEM boost a decade before others went all-in.
Who’s put miles on a 4 Stroke Turbo? Tell us how it feels when she spools up
These were real nice and the engine was an anvil if left stock. Great touring sled.
funny how Arctic started the 4-stroke craze just to ride the Yellowstone Park to please the government and now the only one that is in the park is Skidoo no Yamaha no Polaris no Cat something is fishy there
I had a 05 red and white ST. Could hardly hear running. Could run neck and neck with brothers F6 and half the gas stops. Used to tick him off. But when Z1 come out had to switch .
I just picked up an 05 that caught fire. Does anyone know if the wiring harness and other parts are interchangeable? And what years?