Not Ranked
I would recommend contacting a Cobra engine builder that has alot of experience with Cobra exhaust systems and what setup works. There should not be "backfiring" in any situation, if there is there is a reason. One example is I use to have a 1985 5.0 Mercury Capri (Mercury Mustang GT), for some reason there were no cat. converters on the exhaust system. The car would backfire because the person that had removed the cat. converters didn't remove the air pump. I fixed the problem by routing the air pump to the inlet on the chrome aircleaner and then I had a poor man's turbo.
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