Could be so the MAF doesn't go bonkers. Even the the standard RF alleges it doesn't require a tune (and for the record, mine didn't), but it could be those people didn't have the same luck. I'd imagine if they used the OEM elbow, it was to keep a code from popping up.
I wouldn't know for certain though. I didn't have that issue.
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'20 ZL1 Black "Fury"
A10, PDR, Exposed CF Extractor
Magnuson Magnum DI TVS2650R // RFBG // Soler 103 // TooHighPSI Port Injection // THPSI Billet Lid // FF // Katech Drop-In // PLM Heat Exchanger // ZLE Cradle bushings // BMR Chassis-Suspension Stuff // aFe Bars // Diode Dynamics LEDs // ACS Composites Guards // CF Dash // Aeroforce // tint // other stuffs
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