4T means four stroke, and this is about the best tuned racing exhaust for your Vespa or Piaggio 50cc scooter. Turbokit Tuned Racing Exhaust System for Piaggio Fly 50 and Vespa LX 50, with a 2 Valve engine. Sounds good, looks even better, and really takes advantage of your big bore kit and other tuning additions.

Inspired by Scomadi Racing Exhaust Systems. Made for the 2 Valve Engine. 

Please check our shipping and returns policy prior to ordering this part. Performance parts may not be returned under any circumstances.