I am getting the de-cat sytem fitted tomorrow.

The downpipe I have got, has got a metal spacer inserted into it (please see the pictures below) and wanted to know what, why and where fors?

Speaking with Martyn on Saturday, he mentioned he thought that this was a bit of a fad mod a few years back, as a way of keeping the gases from the dump valve seperate from the exhaust gases.

It is only two small tack welds on it so easily removed if I wanted to.

Any information / opinions would be greatly appreciated.