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Mine started backfiring on the second to third shift under hard acceleration after I replaced the cat with a straight through pipe. I am assuming that this is due to excessive fuel in the exhaust.
Been doing this for over ten years with no damage to my engine.
Your results may differ.
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Christopher Mahalick
1984 911 Targa, 1974 Lotus Europa TCS
2001 BMW 530i(5spd!), Ducati 900 SS/SP
2006 Kawasaki Ninja 250, 2015 Yamaha R3
1965 Suzuki k15 Hillbilly, 1975 Suzuki GT750
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