That was my thought when I posted. RUSTY RAT ROD educated me with a ANTI-REVERSION plate made by Magna fuel so I went searching as I had never heard of them. Where I then found a conversation with air flow engineer Darin ? from Reher Morrison racing engines about them. Wilson, Morrison, Magnafuel and others make them. So now we are here stuck in traffic and I didn't pick one up today while in Summit today because I didn't measure my throttle blade diameter. If this traffic ever actually friggin moves I'll order one when I get home.