when the engine is revved hard, there's definitely significant movement and the flex sections accommodate this movement. i think the envy chargepipe would be under a lot of stress all the time if there is no flex section present. i would be afraid of cracking that could occur on the charge pipe due to prolonged fatigue over time.
however, this of course is just my opinion, i have yet to see or read a thread where a charge pipe did indeed crack.
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Current: 2013 F10 M5 & 2016 Mini JCW
2013 GLK350 (gone), 997.1 GT3RS (gone), 2009 WRX STI (gone), e92 M3 (gone)
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