The 147 back box is a thing of utter dribble though. Its ugly and does really spoil a nice looking bum.
Still it can be fixed for not much notes. I can't beleive my OEM one has lasted. Although the flexi has seen better days and rattles a little now at certain rpm.
I hope they do a decent job for you and you get what you want. Just hover around them and make sure its what you want as its your money and I am sure you will get a product that you are happy with.
If they were not going to garantee the work i'd get them to drop the price and use it as a negotiating tool.
I'd even sign a waver for it if the amount they dropped was decent.
Wizard exhausts look great. But the cost is eye watering.
Alfa 166 2.0 Twinnie - LPG and a few trick performance parts