Well it didnt all go to plan.
Basically we were mating a blueflame decat downpipe to the standard
k1 back box, but Blueflame built and sent down 2, 100cell downpipes instead by mistake.
However Blueflame said if we both paid a extra 50 pounds each we can keep the 100cell cat downpipes.
Now ideally we wanted decats, but neither of us wanted to wait up to another two weeks after having waited over 4 weeks already, and considering that because of the mixup we are getting these downpipes for a absolute bargain price, it would have been stupid to reject them.
We are gonna see what the results are like with that setup tomorrow, and then from there shoudl be able to work out whether a cat back would be a worthwhile upgrade.