Hi,
Just collected our 2007 Alphard from having a new complete stainless steel exhaust fitted. An amazing piece of work,my wife and I were invited under the lift to examine the finished job.It may seem unusual to wax lyrical about something that is rarely seen,but as a trained motor engineer and having fitted numerous exhaust systems,this one literally took my breath away.It had been perfectly manufactured and fitted accurately down the underside ,all the various contours fitted to perfection. I elected to have a polished tail pipe and of course the whole length[including a new S/S Cat.] was stainless steel, all the clamps and new brackets were S/S. The sensor boss was also S/S but unfortunately the new sensor I supplied had wiring which was not long enough,so they had fitted the original until I can lengthen the wiring. The cost was £1000 + the usual. Considering the cost of a genuine exhaust at almost double, this is a very good price and should out last the rest of the vehicle. I expect they are able to supply this type of exhaust for Alphards.
The exhaust was fitted in Tavistock by the national chain POWERFLOW. There must be one near you somewhere in the UK.