Put down 201WHP and 254WTQ today, not real happy for 2 reasons, one of which is completely my fault.
I was running NGK 1-step colder plugs for the last few months but realized that the NGK's did not have the extended electrode like the OE plugs brought to light by Sekred!, which really did not work too well..
Yesterday I went to the dealer yesterday to get brand new OE spark plugs, measured the gap, put them on, called it a night. Today, on the dyno, the motor was pulling timing like crazy in all 4 cylinders (-4 on Cyl.3) and the car was not happy at all, I pulled the plugs then realized they were OE plugs for the N/A Fiestas (SP-525) that also did not have the extended electrode and they were 1 heat range hotter then Fiesta ST OE plugs. The OE plugs for the Fiesta ST are SP-532.
Also the shop did not have a decent fan to go in front of the car to simulate airflow, it was a pathetic tiny fan. Anyways that's my rant, wrong spark plugs + very little airflow = today's results!
COBB AP Stage 3 93 OTS V200 tune, stock intercooler