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I personally think the difference from 3"-4"-5" or whatever is negligible. But it does look like a quality product. For my needs, I still prefer the HFC option. On my white car, I get a little bit of exhaust soot on my back bumper and trunk after a few days and that's WITH the hfc. It's got to be a lot worse with no cat.
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2013 F30 335i ///M-Sport
Forgestar/Challenge/BMS JB4
Wagner/Evo Race/M-Performance
2016 F15 50i ///M-Sport
BM3/H&R/Borla
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