CST 9 is the Vega and Lui expansion chamber developed by Martin Cook.
This exhaust is one of only a handful of sports exhausts on the
market. These are ideal for any Vega/ Lui, be that be on a standard
barrel, an after market barrel or one of Martin Cooks, 140cc
conversions. Producing, as with all the CST exhaust range, good BHP
and torque across a good portion of the RPM range. If your wanting a
sports exhaust then look no further! Not only that but they are Hand
Made here in Britain!