inkey$ said:What would you do?! :|
For me, there would be only one choice and that would be 5).
If H&S need to weld flanges onto their X-pipe and charge you £420 for this, just welding flanges onto the existing OEM pipes should cost a fraction of this, so why buy new pipes?
You've been unlucky having the flange corrode in the way that it has done, because, normally, the OEM exhaust system, being stainless steel, should last the lifetime of the car (except for the cats). Unless you're a "noise merchant", why spend any money on a part which is mostly out of sight? I've spent a fair amount of time modifying OEM silencers and they are superbly made. When you get the repair done, make sure that you go back and get the bolts on the clamp retightened after you've driven the car, because they'll need tightening to maintain a seal which will prevent the same thing happening again.
If you don't need the car as a DD, then take your time and find someone who can do the job at a reasonable price for you. Not being silly here, but a blacksmith might be able to help with this, where he can heat the ends of the flange on the pipe to slip a new clamp bracket on to the pipe, and then flare the pipe to retain it, as per OEM. If you are able to remove the exhaust and refit yourself, this will be the cheapest option of the lot. I reckon I'd be able to get this job done for less than £70 within a mile from my home. It's just a case of finding the right people who don't want to rip you off.