96' Talon Tsi AWD Backfire

I have a 96 talon with hahn racecraft 16g turbo aem fpr, full turbo back exhaust 3'' and ported exhaust manifold fuel is set at 40psi idle. My problem is when boost gets up to around 12 psi the car backfires just trying to figure out why. Any help would be great.

when the last time you change your plug, and wire ?

I changed the plugs and wires at the end of last summer and the car is stored all winter long.

Check the spark plug gap.

you could also be geting to much fuel and or have an exhuast leak.

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