White smoke from a VW Transporter's tailpipe (or any vehicle's) is rarely a sign that the exhaust *itself* needs replacing. White smoke usually indicates a problem with the engine's cooling system, specifically coolant leaking into the combustion chamber. This could be due to a blown head gasket, cracked cylinder head, or other issues related to the engine's cooling system, not the exhaust system.
A failing exhaust would typically produce more of a grayish or black smoke, often accompanied by a loud noise or rumbling.
If you're seeing white smoke, do not continue driving the vehicle. Driving with coolant leaking into the combustion chamber can cause significant and expensive engine damage. Get it checked by a mechanic immediately to diagnose the root cause.
