[Mortster]

I'm going to throw a massive spanner in the works now...

Not because I'm being a awkward tit, but just more so for information. I ran my bug for over 3 years with a decat system without it being mapped ( standard size exhaust ) with no issues. I did how ever get it checked once a year on the rolling road. Graphs were spot on each time. It went to Scotland 3 times, and once all the way to Switzerland.

Some of you were there at the old SRR, went I had the silly vortex extreme on ( didn't last long on the car, was very silly ) and it still came up with graphs with no issues.

I'm not saying you shouldn't get it mapped, as mapping has move advantages than just equipment changes. But if your just decat'ing get it booked in for a run first, check the graphs are fine, then go from there.