Yeah it's not consistent, it might not even be backfiring as such, just sounds like it.
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It tends to do it when I've been driving off boost for a while then I put my boot down.
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It gets spooling then bangs once or twice hesitating when it bangs.
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Then all of a sudden it'll shoot off.
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I'll try get a decent coil and igniter off a friend and try them for a few days and see how it goes.
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Another thing I've just remembered is that it started happening after I washed the car.
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So possibly water ingress into the engine bay on something electrical?
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Dan.
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