Hmm, they sent out a replacement and the courier picked up my system at the same time. At least, that was the plan, the courier actually returned about 5 days later to pick up the old system. Perhaps it depends on the issue? In my case, the weld inside of the tailpipes had failed, causing an unholy rattling at low revs. Probably not the best solution for you, but it may be an idea to see if you can pop down to their site on a Saturday, then they can swap the systems at their cost?