Good idea, at least you can pin point it when something does happen. I have done that before on my other cars, even left it at the so called expert mechanics and auto electricians for a few days and they cannot even find the fault until the car just stops and a fault code appears. By the way, do yo...

Nah mate gave up trying and wasting money on it, guess I'll find out when it goes bang

I got 2 metres of straight pipe so I can replace the section from dump pipe to cat.

Yes tap in to that brown wire for your rpm signal for the two step.

Some pictures

Hahaha

The Calais is fitted with irs, got under the car today the exhaust has five 45° bends and about 1 metre of pipe so I will order it tomorrow.

Could be a shorted fuel injector try unplugging one injector then try to start it, if it doesn't start plug injector wiring back on then repeat on the rest.

Update Got sick of smelling the oil fumes from the catch can so I did a plumb back setup using two catch cans, i no longer have the oil smell and it's not sucking oil into the intake :D Boosting at 14psi for the time being but will turn it up more soon. Currently sourcing exhaust parts at the moment...

Vs V6
IGN power A4
Ground B1-B2
RPM D12

Not 100% positive on the grounds maybe someone else can confirm.