Yeah it's not consistent, it might not even be backfiring as such, just sounds like it.

It tends to do it when I've been driving off boost for a while then I put my boot down.

It gets spooling then bangs once or twice hesitating when it bangs.

Then all of a sudden it'll shoot off.

I'll try get a decent coil and igniter off a friend and try them for a few days and see how it goes.

Another thing I've just remembered is that it started happening after I washed the car.

So possibly water ingress into the engine bay on something electrical?

Dan.
