I have FI LTH and have tried both 12in and non resonated. Neither of them backfire, as they shouldn't N/A because A) we don't make that much power and B) because the car was tuned properly. Now you can have your tuner enrich your tune near red line to make it backfire. But honestly that's just retarded
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Boosted Performance Single Turbo
618whp/489 tq
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