Sorry, who holds the Riley Intercooler STC?

I just got the AA flight supplement for my T337E.

It does not mention fuel flow anywhere. It only specifies maximum manifold pressure, which is 30.3" at sea level (down from the 32" of the non-intercooled engines.)

As you climb, you can add MP until you reach 31.3" at 20,000 ft on a standard day, or a max of 32" on a hotter day. On colder days you can always use up to 30.3"

Basically, it gives you a chart that makes sure you're putting in the same air mass as before and not going over. Because the induction air is cooled, that same mass has a lower pressure.

There is no extra power (or free lunch.)

Good question, about 10 years ago the Riley STC's address was up in northern Michigan. I have no idea if it still is

Riley STC's
 

Skymaster STC purchased 5 of the Riley STC's last year

Contact
David Brainerd
Masters Air
121 Airport Lane
Mena, AR 71953
479-385-2132