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Why do I get big backfires under over-run?


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Hi. I get big backfires under over-run? They sound like a rifle going off. I think it happens when I dont release the throttle all the way on over-run. Is there a way to reduce this?

In the google link below are five items:

1. Tune file

2. Log file

3. Short video of the big flame and bang

4. Picture of the muffler internals and a video of the construction.

Here is a google drive link: https://drive.google.com/drive/folders/1nagdD2oQ64N-Kn3tbiXZkg-2WONczqTY?usp=sharing

My setup is Link G4+ Blue Storm. 3sge beams with ITB throttles. The muffler is a multiple chambered wrx subaru unit. The car backfired with a long 2.5" straight through muffler also. I thought it would go away with the full subaru cambered muffler but it didnt.

Thanks for your help.

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