Not to want to cause an argument between competing suppliers, but the advice received from MV sport today contradicts milltek......
Hi John
Thank you for your enquiry regarding an exhaust upgrade for your Golf 5 TFSi.
I can confirm that we can provide a sports catalytic converter and downpipe upgrade for your car that will mate onto the standard system. This will enable you to keep and sound difference to a minimum and retail a completely showroom standard look and yet still benefit from the performance increase offered by the downpipe upgrade.
The downpipe upgrade costs £xxx including vat and is available from stock. Delivery is £10 including vat.
Just for your interest I have attached a copy of our latest press release which gives full details of both our exhaust and software upgrades for your car.
If you do need any more information or would like to order, please just ask.
Best Regards
Mike
MV Sport Sales Team
So my considered view is that it could last less time, you will have a more difficult job getting it sorted under warranty if it goes wrong, but you don't really need to go the whole hog and buy a complete system. I think I will start with just the downpipe and 100 cell cat, and if money allows upgrade cat back later.
John