Quest did sell that stoopyd off-sized 20mm D5 for a while but their E12 and F15 were pure vaporware in the commercial market.
What i said then I'll say again now...we have a need for PORT/CORE burning E and F BP SU motors like the old Mini-MAX Centuri offerings. End-burners...meh.

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When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !