GMR cross-over box improves the flow of exhaust gasses to create an extra midrange torque and an increase in top-end power, especially when combined with the equal length manifolds (above). What’s especially noticeable is the change in the exhaust note (much smoother)allied to and the engine’s ability to gain RPM rapidly, hence the increase in torque and power. What must be noted, is that the exhaust note is very different from the off beat sound of the std V8. Far more linear and urgent.

Price includes fitting. 

They can be supplied by mail order, please enquire.