MK2 FACTORY SPORTS EXHAUST

[mikeulster500]

I found out recently that the factory have stopped supplying Janspeed sports exhausts as standard and are now supplying magnex instead. Is this true?
What is the difference in sound of the Janspeed compared to the Magnex? If you fitted a Janspeed exhaust to the car would your cars warranty be void even though it used to be a factory approved component
Cheers
Mike